My girlfriend is really mad at me because I found her eating a cookie, but I really don't understand why she is mad.

Here is my story.<br><br>Recently, my sister went on a special diet. She recently had her first baby, and I guess she didn't lose quite as much of the baby weight as she wanted to, so she's going on a diet. She's really passionate about this, and she has lost something like 30 pounds since she started. She still has quite a ways to go, but I'm really proud of her. Honestly, I think that she still looks great, but I can't change her attitude about her body.<br><br><br>My girlfriend and I were visiting my sister and brother in law. My girlfriend was in the kitchen through most of the visit, which I thought was really sweet. She kept pulling out fruit and stuff and using my sister's blender to make smoothies. My sister was super excited and started talking about this new diet that she was going to start. I didn't really pay attention because I've heard her talk about a lot of diets, but my girlfriend was really excited. She said that she has been on this exact diet for three months and that she really likes it. She said the food is really tasty and healthy, so my sister was very excited. She was talking about how the diet is special because you can eat a lot of the food on the diet, it's just expensive because you have to buy this prepackaged stuff. She said she was thinking about doing a subscription, but was worried that it would be too much to spend on food every month.<br><br><br>Then my girlfriend said that she was thinking about signing up for it too. I was really surprised by this, because my girlfriend doesn't need to lose weight. She's actually a fitness instructor and has three classes a week, plus she goes to the gym by herself. She buys really healthy food usually, and she's been on a few diets but always stops after a few months because she thinks that it's too hard to eat all of the healthy food. My sister was really surprised by how difficult it was to stick to the diet, and it made me feel bad for her that my girlfriend was going to be able to look so much better.<br><br><br>While we were visiting, my girlfriend kept going into the kitchen and making these smoothies and other healthy snacks. My sister really liked them, so she asked if my girlfriend could make some more. My girlfriend went into the kitchen again, through the hallway, and through a door that leads to the pantry with all of the prepackaged foods for the diet. I was walking behind her, but I stopped in the hallway because I had to use the bathroom. When I came out, my girlfriend was in the pantry eating this cookie. I was so confused because my girlfriend had just made some more smoothies and stuff for my sister. I thought that maybe she had bought these cookies for my sister, but then I noticed that my girlfriend was eating it. I asked her what she was doing, and she said, "Oh, enjoy this cookie. I picked it up for you to eat while you are here." I was confused, but I ate the cookie.<br><br><br>When we got home, my girlfriend was acting very strange. She was being very quiet and distant, and she wouldn't talk to me. When we were in bed, I asked her why she was being so quiet. She said, "I just feel like such a liar." I asked her what she was talking about, and she said, "I'm talking about how good I am at lying." I asked her what she was talking about, and she said, "I told you to eat that cookie, but it was actually for me. I didn't want you to know that I was eating it." I asked her why she cares, and she said, "I've been eating those cookies every day since we got here. I told you not to tell your sister because she will feel worse." I was surprised because my girlfriend really doesn't like cookies. At least, I thought she didn't. She never buys them and doesn't usually eat them when they are around. I asked her how many cookies she had eaten, and she said, "A lot. I finished all of the bags. Every day when you left for work, I would come here and eat all of these cookies. I would always make sure to throw out the trash before you came home so you wouldn't see it." I asked her how many cookies she thinks she has eaten here, and she said, "I don't even know. I've lost count. It's so embarrassing. I gain weight so easily, and I've been eating all of these cookies. I was trying to hide it from you, but I felt so bad." I told her that I don't care if she eats cookies, and that it's fine. I would never judge her for eating cookies. I told her that she should have trusted me and told me from the beginning. I asked her why she was hiding it, and she said, "I was hiding it because I was ashamed. I don't want to eat all of these cookies, but I can't stop myself. It makes me feel guilty, and I don't want you to know that I'm doing it." I told her that I was disappointed that she didn't tell me, but it's not a big deal. I would never care about something like that. I told her that she shouldn't feel bad, and that I would never judge her for eating cookies.<br><br><br>Well, my sister called me yesterday and asked if I was doing okay. I said I was fine, and she asked why my girlfriend and I haven't visited in so long. I said we would come visit this weekend, and she said, "Please don't come this weekend. I really need some time to myself." I said okay, no problem, and then she said, "You know, I was really upset with you and your girlfriend after you visited. I don't know if you remember, but your girlfriend went into the pantry and found your girlfriend eating a cookie. She told me that you were eating it, but she said she thought you might be lying and eating it together. I don't think she believed you, because she didn't say anything until after you guys left. She said she was so hurt that you guys were eating cookies behind her back, and that she thought that you guys were making her feel bad about food. She said that she didn't feel like she could trust you guys anymore, and that she was going to stop hanging out with you." I asked her what she was talking about, and she said, "Your girlfriend lied to me about the cookies. She told me that she had gotten them for you, but they were really for her. I felt so betrayed because I thought she was my friend." I didn't know what to say, so I said, "I'm really sorry. I didn't know she felt this way." She said, "I feel like I can't trust you guys anymore. I'm going to have to think about it before I hang out with you guys again."<br><br><br>I feel like I'm in trouble. My girlfriend was acting really weird this whole week, but seemed to be acting more normal now. Then I talked to my sister and she is really mad at us. I don't know what to do. Honestly, I really don't care if my girlfriend eats cookies. It's not a big deal to me, and I never even thought about it. I feel like my girlfriend tricked me, and now my sister thinks that we lied to her and betrayed her trust. I feel like my girlfriend is trying to manipulate me and control me, and now my sister is mad. I don't know what to do. I love my girlfriend and my sister, but my girlfriend did something really shitty to me. I don't know what to do. I feel so confused.<br><br><br>Edit: Wow, thanks for the awards guys. I really appreciate it. I'm pretty overwhelmed by all of the responses, so I'm going to try and respond to a few and then probably stop for the night. I'll try to get back to everyone tomorrow. Thanks!<br><br><br><br>Edit: Okay so here's what happened. I talked to my girlfriend and I told her what my sister said. At first, she didn't know what to say. She was trying to come up with some excuse, but then she just started crying. I asked her what was wrong, and she just kept crying. I asked her again, and she started yelling at me. She said that she feels trapped in this diet, and that she was trying to get out of it. She said she doesn't want to hurt her figure or her career, so she needs to stay thin. I asked her why she is on this diet, and she said that she was trying to support my sister and lose weight. She said that my sister was really excited about the diet, and she thought that she needed to support her. She said that she's actually been gaining weight, and that she needed to lose a little. She said she was doing this diet to get the weight off, but now she is feeling really insecure and self conscious about it. I told her that I don't care if she loses weight or not, and that she looks good either way. She thanked me and hugged me, and said she was sorry. We talked for a while, and then I called my sister. I told my sister what happened, and she said she feels bad. She apologized for jumping to conclusions, and she said she hopes we can work it out. Honestly, I'm still really confused about the whole thing. I don't know what to think.