I need some advice on what i should do about this situation with my boyfriend who I have been with for 3 years?

Me and my boyfriend stay together and we broke up in January because (well i kinda messed up and talked to this other guy which i shouldnt have did at all),but even though i did he used to talk to females way before i talked to someone else.So I just thought if he could do it then i could do just this one time....but it turned out whn he found out about it he broke up with me...and now its been 4 months since it happened and every since then he has had with another gil i caught him taking the girl out to eat and everything and I still forgave him for it because i love him so much and i felt that If you love someone to the point were u think u cant live without them and if you really want to be with them then you let the past be the past and move on but he's still like stuck in the past...sometimes he dont come home until about 11 and when i try to call him he wont answer the phone then when he comes home he trys to talk to me like everythings okay and i feel like he still trying to get revenge on what he think i did and im like so confused on what I should do. Somedays he tells me he loves me and then somedays he treats me like i dont mean anything to him. And I just love him so much that Im just so confused and I just dont know What to do anymore.. Someone Please HElp!