Am I the bad guy here?

My ex ended a relationship with me 1 year and half ago. It was a long distance relationship. Somehow we managed to talk again now, and I kinda missed talking to him even thought inside I don't love him anymore. The last 2 months of our relationship was rough, arguing, we were barely even talking to each other and at some point I felt like I was the only one trying to keep the relationship going, I loved him so much I couldn't let go until he decided to do it for me. I always tried to make him as comfortable as I could. Now that we talk again he claims I did "some horrible" things to him, things that I don't remember, he doesn't specify either. He makes me feel as a horrible person, and even when I say sorry he says "It's useless to feel sorry after all the damage you've done"
I cried for months after him yet he got a relationship only after 3 months after the breakup. Is he trying to manipulate me into feeling bad for him? Should I block him and leave him for good? I don't know honestly it's too much.