Relationship issue

Well me n my bf been together 4 yrs n at first thing was going right the second yr together we had a kid together n that’s wen I feel like things went down hill he job a job started cheating n lying bout it the girl would post stuff on fb he he kept having me thinking I was crazy but wasn’t then your son comes along n he still was doing his own thing hanging out with his buddies, cheating, lying n etc. But then I left him n for bout 6 months everyone would tell me I was wrong give him another chance well I did now I don’t know if it me or I can’t deal I’m having a second child n it’s like he said well I’m not cheating but it’s not the cheating that gets me it’s he doesn’t do want he suppose to do me n my son sit at home all the time we don’t do nothing as a family together me n my son is always riding out by ourself if I ask him to do something he be like I’ll do it later but his family or friends ask he jump right up. I cook, clean up, wash clothes, make sure your son has everything he need but when he get paid he always on the go n if I leave to go somewhere n I don’t answer my phone he thinks I’m cheating n not I’m pregnant n when he gets home n I’m not there he leaves but claim he with his homies when his at work he gets upset if I don’t text him all night I tell him I’m tired I’m carrying a child n deals with one all day but n his mind I’m cheating n it’s really pissing me off cause I don’t cheat I really have starting losing feeling for him but he don’t understand y first u cheat n that took a lot from me cause I never cheated on him then I take him back n things still not right now is it me tripping or he need to be by his self cause In his eye he doesn’t nothing wrong n he says he really love me loved don’t suppose to be like that