I’m not good enough for my bf

I just spent the last two hours crying because I realized that I’m the ugliest and fattest girl my boyfriend has ever been with. He tells me I’m pretty and that he loves me and that he sees me in his future.

But I just can’t shake the fact that I know he’s settling for me and I just feel bad that he’s even with me because he can do so much better and he has. I just feel like it’s gonna end because I’m not perfect and I don’t look like the girls he used to date. :/