am i overreacting for hating my boyfriend because he comments on other girls' photos?

[Scotch]

he likes photos of other girls and that doesn't really bother me.. but what i hate is the fact that he leaves comments like "sublime" "beautiful, as always" "gorgeous" etc. i havent talked to him about it yet because i'm not sure if it's just me being jealous and insecure, or if other people would be upset if this happened to them too. would you be angry if your bf/gf left comments like that for people other than you? he compliments me all the time and says that he doesn't look at other girls blah blah blah... i'm the only one for him, an angel, etc. but after discovering his stupid comments on other girls' photos, every time he compliments me i just want to punch him in the face. lol. it make me even more infuriated when he gets upset if i talk to other guys or find someone attractive. of course there are beautiful people everywhere but why would someone have the need to comment on it? i feel like it's disrespectful because it's like he doesn't appreciate what he has. i see handsome men everyday and have handsome friends on facebook but i don't like their photos or tell them they're gorgeous. i just doesn't feel like a respectful thing to do if i'm in a relationship. i don't even know how to bring this into discussion with him.

please help me out by expressing your opinion and if you have suggestions on what i can do, let me know as well. thanks in advance for your help, i really appreciate it.