Whats Up With This Picture?

Mkay..So my boyfriend and i hang out almost all the time at school. Lunch, between breaks in the mornings after school everything. But one day at our lunch break he stood by me and i was standing by him (oviously) anyway this girl comes along pushes me out of the way and hugs him then pushes me again and says move *****.. i looked at him and he didnt do anythign about it i let it go thinking o well but then the next morning this girl that he says him and her are just Buddies comes up to him tells me i know hes your boyfriend but were buddies anbd hugs him from behind (i hope you know what i mean). i couldnt take it i walked off and he got pissed. he got over it and so did i we are still going out but that trifaling witch keeps doing this over and over again and he just lets her do this and hes got a gf. then they always whistle at each other. im think she more then just a buddie maybe a good friend with benifits. Help me plz i dont know what to do should i break up with him or leave it alone