What do I do?!?!

So me and my boyfriend have been dating for seven months now he got arrested in May and he hasnt been home I have not talk to him the first month but finally got a hold of him ending of June. there is a lot of cons about my boyfriend(idek what we are) he steals(from other people and his own family), hes selfish and careless to the other people and he never listens he always talks. I have known for some quiet time about his real colors but Ive still stayed to help him. Over the past months he learned how to be more thankful and Ive helped him get a job. The reason why hes in jail now is because he did not listen to me when I told him to turn himself in now he has to go through hearings and more bull. So the hearing he just had he was supposed to come home but he didnt and I warned him if he did not come home I was breaking up with him because, me personally Ive never had to deal with this ever. Ive never dated a guy that was in jail before or was going to jail. So I broke up with him and hes been calling my phone but Ive been ignoring it. I slept with someone else and after I felt so guilty like I was balling in tears. I never wanted to be with him as much as I do now and I regret it 100%, hes my best friend and even though he has problems within himself I stay with him because I love him and Im trying to help him. He called me today and I was balling in tears and I told him what happened and hes not even mad hes just like it is what it is I cant be mad at you because youve never been in this situation before and he also said he loves me with all his heart. He said when he comes home were gonna have a long talk but it seems like he forgives me but Im not sure, I know for a fact I cant forgive myself. Granted I was single I moved on to quickly and my heart didnt want to move on. I havent been eating and just got more and more depressed because I hate myself now entirely. Hes the only person that has my back and would do anything for me and he treats me really well. I just messed up and I dont know what to do or how to resolve this or the worse comes to shove and move on from it. I need help because in order for us to move on from this I need to forgive myself and honestly Ive never cried so much.