What is something you cannot stand that I can fix by tomorrow night?

For context: I'm a 25 year old man, and my girlfriend (27) and I have been together for 3 years. We're living together currently, but I'm thinking about breaking it off.<br><br>I was sitting with her on the couch tonight when she went off on a tangent about how I'm just letting myself go. I don't know what triggered it, I was browsing Reddit in my boxers and a t shirt when she went off on me for gaining a little weight (believe it or not this was the first time I noticed her getting mad at me for it). She started ranting about how I'm just a slob in general.<br><br>&#x200B;<br><br>This was basically the straw that broke the camels back. She was a wonderful girlfriend historically when it came to affection and dating and all that. But lately she's been absolutely insulting and hurtful in her words. In fact, I'd say that for the most part of the last few months she's been downright mean to me. But I've been told if I "just lose a little weight, she'd be happy".<br><br>It seems to me that most of her problems with me can be solved by just losing weight (I'm a skinny guy at the moment, so "letting myself go" is relative in this case, but I do admit that I'm not in the best shape). And I have full intentions on doing so. I have my first session with my new trainer tomorrow and I've started hitting the gym almost daily. I'm also eating more healthy.<br><br>So, internet, how could I be a better boyfriend to her? What are things you can't stand that could be fixed with some hard work and determination on my part? What things are you unhappy with in your own relationships that your significant other could fix? What are things we can fix that would make our SO's happier?<br><br>EDIT: Wow, this got more attention than I thought it would. Thanks for the feedback so far. For those wondering, it's not that she's been gaining weight and telling me I'm letting myself go.<br><br>&#x200B;<br><br>> She was a wonderful girlfriend historically when it came to affection and dating and all that. But lately she's been absolutely insulting and hurtful in her words. In fact, I'd say that for the most part of the last few months she's been downright mean to me.<br><br>This is becoming more and more true, with "the last few months" becoming closer and closer to a year. I love this girl with all of my heart and I believe she's just going through a tough time in her life and is taking it out on me. However, the amount of venom she spits at me is starting to get to me. She's called me disgusting, gross, fat, and ugly to name a few. And given the amount of venom she spits at me, I'm starting to think that she's not the girl I thought she was.<br><br>&#x200B;<br><br>> I have full intentions on doing so.<br><br>I have full intentions on doing so, but I don't think I'll be doing it with this girl anymore. At this point I think I'm just trying to get better to feel better, ya know?<br><br>&#x200B;<br><br>> It seems to me that most of her problems with me can be solved by just losing weight<br><br>I'm coming to realize that the amount of venom she is spitting at me can't be solved by that, especially when I started losing weight and she went off on me for "not losing enough". At this point I'm just starting to think that I'll never satisfy her.