Why do people insult my looks in my relationship?

I just don’t understand it. For context me and my girlfriend did have a rocky start and I wasn’t the best person and it has affected her and we have been working on it. She would go to her friends (and still does) and they all follow the same pattern in what they say like “your gorgeous” and “you can do better, your way out of his leauge” or “your doing charity work” and it’s like why tf do you need to attack my looks? I’m not even that ugly. Like yeah my girlfriend is beautiful and has a curvy body and everything but why my damn looks? This was a character issue in the beginning and so it’d make more sense to go after my personality…a guy’s confidence is everything and I’d be lying if I said this didn’t do a number on my self esteem. To make matters even more ridiculous. One of the girls that called me ugly had a crush on me and said I was out of her leauge and told me I was hot etc and according to my girlfriend she said her friends that said I was ugly used to say we were a cute couple…what’s going on? This stuff stings/hurts and is confusing me