Conflicted?

A while ago, I dated this guy. Our relationship was great, everything was fine. Until, you know, he breaks up with me. I couldn't tell you for the life of me why he did, but it happened and it sent me to a dark place. I did slowly get out of the ditch I fell into, but it was a painstaking process. I recently got a girlfriend and we hit it off right away. Our relationship is going better than I ever thought it would, and I'm super happy. Even though it's long-distance, we're keeping our relationship alive. Now granted, I've had some shitty, and I mean SHITTY, relationships in the past, so don't get me wrong, this is very different for me. I completely trust her, am willing to tell her pretty much anything, and hold immense respect for her. And then, the bomb drops. My ex reached out to me about 2 weeks ago, and I'm trying to keep my cool with him. Every time we talk, I get extremely pissed off because he tries to make the situation about him when he's asking about how I'm doing or what's going on in my life. Somehow, he manages to weed himself into my life when I successfully shut him out. And then he tells me that he still likes me, which made me absolutely lose it. I made it very clear to him that I have a girlfriend and that I got over him a while ago. See, I still liked him after we broke up, and I tried for MONTHS to get him back, but he never responded. He ghosted me in a way, even though he promised that we would still be friends. What makes me even angrier is that when I asked him why he broke things off with me, he said that "he was a fucked up person, but he's changed". Like I'd believe that, right? I mean, only a few months after we broke up, I found out that he'd gone through 6 others after me, which gave me no confidence that he'd changed whatsoever. This is all bad, but the worst part is that I still have feelings for him. I'm ashamed to say that I miss him, but it's the truth. I would never cheat on my girlfriend, don't get me wrong. Even if we are long-distance, cheating is a no-go in my books. How do I deal with my ex? All of my friends hate him, and so does my therapist, but no one is telling me how to get rid of this pest! I want to get rid of my feelings for him, and that's why I can't make myself block his number. I'm feeling quite lost right now, and if I wasn't desperate, I wouldn't be writing this.