I think there's a number of things going on here;

• You're in the final juncture of your university life, so being healthy and fit can sometimes fall by the wayside. In my last 6 months of university I put on about 10lbs but I was a healthy weight and I carry it primarily on my hips and ass so it wasn't too obvious.

• Your boyfriend obviously cares about health and fitness, and he sees you slipping and caring less about how you look and he's getting frustrated. This is spilling over into him hinting at you with comments about other people's weight and asking you if you're working out. While not necessarily mean, it's insensitive and he isn't helping matters.

• You know you need to get fit and healthy again, but right now you don't have time.

• Your self esteem sounds really low, so obviously everything feels more intense and a bit meaner.

I think this can be worked out. I was in a relationship where my partner gained weight (like, a lot...) and it took him from healthy weight range to obese. He promised to change and never did for over a year and other issues in our relationship meant eventually I broke up with him. It was his attitude more than the weight, tbh.

I don't see any of the red flags I saw in him in your post here, you seem to recognise that you need to change, and that's great! That's the first hurdle. I think you should sit down with your boyfriend and tell him what you've said here, starting with "hey boyfriend, I have been noticing lately that I have gained some weight and it's effecting my self esteem. I am really busy with work just now but I would like to work on it after we graduate." Then you can broach the subject of asking him to stop with his comments, and maybe you can both be gym buddies and learn some cooking skills to eat healthy? I used to go to the gym with my ex before his issues, and it was such a nice bonding exercise as we could spot for each other and get sweaty and work hard!