Guy's Behavior

I'm getting back in the dating game but what is up with my ex? Why is he keeping this up?

To make a long story short, my ex told me back in September that he was seeing another girl. For most this year, him and I had been talking I thought things were getting back on track for us to get together. Well toward the end of last month, he ended up telling me that things got serious between them and that we couldn't talk anymore. So after that I didn't contact him like he asked. Well yesterday I was at work and he texted me hey and tried to call me. I told him I could text but would call later. Anyway, he said that he figured he would give me closure. So that's when I went ahead and called him. That's when he told me that things didn't work out between him and the girl. While this conversation was happening, I didn't really understand what this had to do with closure in my mind. Well we ended up having an emotional conversation and he ended up going into detail about why the situation played out the way that it did between us. The conversation was only 20 minutes since I had to be back at work. So I talked this all out with my friend last night, and she suggested asking why things didn't work with the girl since he did bring it up to me. I asked him if he was still up. So this morning he texted to say that he wanted to let me know that he was still dealing this girl after the text from last night. That's when I called him once again and we talked some more. That's when he told me that he wasn't in love with me, he loves but that he is love with this girl. He told me that she loves him but isn't in love with him. So basically she's to him what he is to me. He also told me that she knows about me and that we've been intimate. But he said he told her that I'm a good woman and would make a wife and he said she got jealous and asked him why he wasn't with me. But I just wonder why he's coming back and doing all this and when I'm starting to move on with something else. I don't really understand what the point of the random call was. What do you guys think?
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I also want to add that he pretty much tried to say that we weren't together when he started talking o this girl and I understand that. But the way we were talking, it was as more than friends kind of like how we were talking the first time around like before we started dating. So I was trying to explain to him that it was wrong to lead me on when he was talking to someone else. But he came out of nowhere with this, but when I wanted to talk about it some weeks back, he was responding to an..
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.. extent and even the final text he didn't have much to say. When I pointed out how he would feel if I did the same thing to him that he did to me, he got defensive and told me not to come at him like that. I just don't really understand why this is all coming up with him.
I'm getting back in the dating game but what is up with my ex? Why is he keeping this up?
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