Wow.
First of all, Congratulations on getting so close to your goal of weight loss!! I think it's fantastic. You've definitely acheived a lot and no one should belittle that.
If you're in college, are you on financial aid? I lived on financial aid in college. I had a tiny apartment that I lived in alone, but it worked out really well. Sure I had loans that I had to pay off, but it wasn't that bad and I did pay them off. I guess my point is if the only reason you're staying is because you feel you have no options then understand that is not true. There are ways to move out. They may not be fun options, but they might be better than feeling trapped.
However, if it's not the financial situation then you'll need to decide if you're willing to continue to give yourself to someone who treats you this way. I personally think that if she doesn't want you now then she'll come up with some other excuse as to why she doesn't want you when you do reach your weight loss goal. It may not be good enough for her. And that's not good enough for you. I can't really offer any concrete advice because I'm not in a relationship. But I can say that I'd rather not be in a relationship then to put up with that crap. You're worth more than that. We all are.
But good luck. Only you can decide what's best for you. Just don't waste years trying to figure it out. Time is precious.

your girl friend reminded me by me ex girl friend. I was in good shape but i have a little bit extra fat in my billy so she always made me feel bad for that, sometime when we made out or sleep with her i cant take off my shirt because i don't feel secure about my body anymore 