not the same as the rest

When I first got together with my SO he made a remark that people were asking him why he was with me because I'm not like his exs and not his type to this I ask why? Thinking I'd get the answer like I was more kind his answer was "I usually go for skinner girls and attractive and my exs were like models" of course I just brushed it off and then it got me curious to what they looked like after some snooping they aren't anything like models, I'm sorry but they weren't exactly skinny or extremely attractive. This popped into my head today and maybe I'm feeling abit emotional from my meds but it hurt. Is this why we don't have sex as much? Is he with me because he can't find anyone else? Am I to blame for him texting other girls? In my eyes he's beautiful but he's not most girls cup of tea. He's not athletic himself; he's a big guy. I just don't know why he's with me tbh. I want my man to think I'm the most beautiful girl in his eyes. I want someone to want me and only me not to be compared to exs. I'm so fed up with being ugly, fat and useless it sucks