I would probably assume they were just friends unless they were holding hands or something. Then, I'd assume he was one of those rare hot guys who didn't realize he was hot (yet). I don't see many of these couples around, except when friends tell me how much better looking their boyfriends are than them, and when I finally meet the guys, they usually look like trolls lol
I don't care about people I don't know at all. If it was a friend though and her personality was a bit off I would tell him he could do better in both the personality department and the looks department. If it was a really sweet girl and he liked her a lot I wouldn't give an f.
My SO is very handsome. I am just average looking. But if you get to know me you will understand that we are. Very compatible from matchinf site and we are good together. He doesn't like it when people say that he is handsome. I have gotten stares from prtty girls before.