Should I forgive him or move on.

So about a year ago I started to hook up with this guy. We would hook up on a weekly basis about two days a week. I loved his company and he showed me what feel safe is supposed to feel like. This went on for about 2-6 months. There was mutual feeling that grew as we kept seeing each other but we made it clear in the beginning that we weren't ready to be in a relationship but as we grew a connection toward the ended that were we both started to have feeling. Sadly we couldn't explore that because about shortly after we stopped talking and then he just vanished no one knew about him and come to find out, he was in jail for a year and four month. He was released on Friday. He reaches out to me two day ago.. He tells me that his bbm put him in jail. Blah blah then tells me that he wants to continue what we had. But then he throws a bomb at me by telling me that shortly after we stopped talking he went back to his ex which just happens to be said bbm. So at this point I dont know how to feel because we weren't in a relationship and he really doesn't owe me anything but he think that I can pretend like this doesn't bother me considering what we had. But I cant help think about what it was like being with him the safety. But I also feel like what we had was a lie because while he was with me he was entertaining her. I know that we were hooking up but if we mutually liked each other then he shouldn't be talking to someone else.