Help please!!! its a relationship problem!?

i have been with my boyfriend for 3 months but his friends didn't know we were going out and there is this girl who likes him but he doesn't like her, he likes me and all of his friends know her and they thought he was going out with her but he told her that he has a girlfriend. and now when his friends see us in the hallway they tell him he can do better and when he post on facebook that he loves me they comment by saying ewww. the thing is he is kind of popular and im not, im a honor student and he is not good at school works. his friends are getting on my nerve but i tell my boyfriend that i don't care but i dont think i can take it anymore, what should i do?