My (23F) boyfriend (25M) invited a girl from his gym to come over and watch a movie with us. I’m pissed but would love to hear your thoughts before I say anything.

My boyfriend and I have been together almost 4 years. Things are great; I would say we have an awesome relationship. I trust him completely.<br><br>He’s been going to the gym a lot lately, and there’s this one girl who “always” greets him when she sees him. He’s mentioned her a few times, nothing malicious. Just mentioned that she always greets him. One day, he came home and said she asked him what he was doing this weekend. He said he replied “the Usual; just me and my GF chilling at home”.<br><br>Fast forward to 2 weeks ago, he told me that her gym membership is on a 3 month trial, and she said the gym is too expensive and she won’t be renewing once her trial ends. I don’t know why he told me this, but he did. He even said “she asked if I work out at home, and I told her no. She said she might stop by to use our weights sometimes but I told her I don’t have any”. I found this whole conversation kind of weird, but I let it go.<br><br>Then tonight, he told me that she’s in his fitness class and after class today, she told him she’s sick and tired of going to the gym, and said something along the lines of “I don’t think I’ll be renewing, it’s too expensive and I’m tired of this gym, I don’t feel like going anymore”. He said he told her “you can come over to my place and work out, if you want” and she said “I’m not much of a weight person, I like cardio, and you said you don’t have equipment”. He said he replied “Oh, I have an exercise bike, and a spinning bike; she said that sounds perfect”. He told me that she then asked if his GF would be okay with that, and he said “of course, she’s totally fine with that”. He said she asked if his GF is going to be present when she comes over, and he said yes.<br><br>I was shocked that he invited her over to my house without asking me first. I told him I don’t want her over when I’m not there. He said, “don’t worry she’s not coming over when you’re not around, you’ll be there. I told her you’d be there as well, and she said that’s great; she’s not comfortable coming to a guys house when the girl is not around”. I asked if she’s coming over to work out, or what, and he said “no, actually, she said the gym is expensive and she doesn’t want to go anymore; she said she’ll just stop by our house to use our bikes here and there; nothing major, maybe an hour here, an hour there”. I asked if I was gonna have to sit there and watch her do cardio for an hour straight? He said “no, she’ll probably be here for an hour or 2 after work, and she’ll spend most of the time talking to us, and she’ll do 15 minutes one hour, and then do 15 minutes an hour later, for example, that’s it”. I told him I’m not okay with this, and he asked why. I said I don’t want some random girl from his gym just randomly coming over for an hour or two while we’re home, just so she can do 30 minutes of cardio in total. He said fine, then she can come over to watch a movie with us, (like every Friday, we pick a movie to watch together). I said “I don’t want some random girl from the gym chilling at my house, that’s my time with YOU, my boyfriend. I don’t want to waste my time with you, by having this stranger over to spend time with us”. He said “she’s not a stranger, I just invited her over, and she said yes, that’s it”. I told him I don’t want some random girl over, but he said “she’s not some random girl, I’ve been chatting with her for 2 months now”. I told him I don’t care if he’s been chatting for 2 months, I don’t want her over. He said “it’s no big deal; she wanted an excuse to hang out, and I thought it would be a good idea for all of us to hang out together”. I asked if this was all like a precondition, like she wanted to hang out with him only if his GF was there, kind of thing. He denied it.<br><br>I told him I’d never ever do this if I were him; invite some random guy over just because he wanted to hang out and I told him no thanks. I told him to call or text her and tell her that I said no, but he said “No, she specifically said that I had to ask you first, and that she wanted me to ask you, and that she only came up with the idea of me asking her over, because she wants to get to know you better”. <br><br>I told him to tell her no, but he’s being stubborn. I asked if he would date her if I broke up with him, and he said why are you bringing that up, of course not. We then both got ready for bed, and fell asleep.<br><br>However I just woke up an hour ago, and on his phone I saw a text from her phone, (I don’t know how he has her number, since he never mentioned having her number). It was a text from her phone (dated tonight) that said “Hey, did you ask your GF?”. And he replied back “Yes, she said yes. You can come over this Friday, we’ll watch a movie together like I said”. I’m seriously pissed; first of all, how does he have her number? He never mentioned he had her number. Second of all, I said no; I told him no, but he went behind my back and told her yes. I feel like he went behind my back because he knew I’d never agree to this, and I KNOW he would never do this if I invited a random guy over to hang out.<br><br>What do you think? Do you think I’m being unreasonable? How would you feel if you were in my shoes? Honestly, how would YOU feel?