How do you handle a situation like this?

My ex and I have been involved with each other for over a year now. It’s pretty much off and on, we’ll go months with being consistent then he’ll go ghost for a few weeks. We officially started dating again earlier this year but broke up 2 months ago. We went almost a month with no contact, which was really hard for me cause I’m usually the one constantly apologizing and trying to figure out if I did anything wrong. I just decided to leave him alone and try to focus on myself. I was starting to make a little progress then he texted me. Eventually things went back to how they were with us talking all the time for hours, even while he was working. Everything was fine until Tuesday night, we had a disagreement. I was a little upset, but he has this thing where he’s always right about everything, I didn’t want to argue so I was silent for the rest of the phone call. He said he’d call back but didn’t. I called and texted on Thanksgiving, but he didn’t reply. I figured maybe he was busy with family and texted him Friday, no reply. I’m guessing I did something, but I don’t know what I did. I just don’t understand how you can act like you’re so into someone one minute then go ghost the next. When we started talking again he’d be the one calling me all the time. I’d tell him I’d call him when I got home, and if I didn’t call exactly after I got home he’d ask me why I didn’t. I decided that I’m not going to reach out again, although I want to I feel like I already know what’s going to happen. Has anyone ever been in a similar situation? How did you handle it?