Is he still Cheating ? ughh y ?

My Current Boyfriend and I Have been togather for two years now & everything was good until he claimed to have a female bestfriend , they began hanging out alot / behind my bck , she NEVER liked me frm the looks she qave me . Me.& him broke up for week , they had sex . He came right bck to me apologizing ! Of course.i took him bck smh. - I had heard through a mutural.friend he was dating both of us ,i confronted him abt it & he admited it, once again I took him bck !!? We had got better , now im starting to hear things about them two again , what should I do . I really do love hin , but im very pretty and dont deserve all.of this at all . Especially.not.over the town smut.