What to do when your boyfriends being a prick?

my boyfriend we have been bestfriend for 3 years and we have been going out for about 2 months and i really love him he cheated on me and basically begeed me to stay with him and told me he promisees not to do it again and he really loves me and that he didnt realsiee itn tell afterhe did it baring in mindd he told me like a month and a half laterr:/ i love him alot and really cant breakup with him even though i think its the best thing we get along so well but i cant do it i love him loots , one min hee says how much he loves me the next hes off im constantly talking to him about it but he dont seem to take notice really and hee blows me out alot and he acts different in front of his mates but then the next minute he telling me how much he loves me again what do i doo he dont listen:(xxx