<human>: Condense the text into a few key points

This is kind of an odd situation. I've always had problems with my self esteem, I've never really felt pretty or skinny. My current boyfriend has helped me A TON with this. I'm actually starting to feel attractive some days, which is a bug jump from where I used to be!

My problem is this. Even though he's been very supportive, like giving me compliments, staring at my butt, etc, I feel like our relationship won't last. He's very set in what he finds attractive in a girl, and I don't really fit into that category. He likes very small petite girls, and while I'm not big (5'10", and weigh about 160), I have bigger boobs and a bigger butt than anyone else he's dated. At least from what he told me  

I do feel like he finds me attractive. I just don't feel like it'll last. We actually talked about what would happen if either of us were to gain weight, and he flat out said that he wouldn't have sex with me if I did get big, but he'd still keep dating me. What kind of a relationship is that?! I've seen girls that he calls 'fat' and to me they are perfectly fine. I'm not sure what to do. The person you're dating is supposed to be the one you feel most attractive with, not the other way around. What should I do?
<bot>: I feel attractive to everyone but my current SO. It's almost as if any little change in my appearance or weight will kill our relationship due to me not fitting into his 'usual' type. What should I do?