[taylalatbh.]

First off, don't panic! Just because he finds someone else attractive, doesn't mean he's going to run off with her. It's okay, while in a relationship, to find other people attractive as long as you don't act on it. It's not really nice that he shouted out that she was attractive though, so that's something you should talk to him about.

Let him know that how he has described her is upsetting you. There's no need for him to talk like that infront of you. Also, don't let yourself get upset about the differences in your appearances. Just because she's skinny and smells nice doesn't mean that's the type of person that he wants to be with. He's picked you out of all the other girls for a reason, he likes you for you.

Mainly, just let him know that you're a bit upset and talk it through. Good luck.