Why do we argue like a married couple?

I was in a situation with a guy for nearly a year. We’ve never dated at all mostly because he didn’t want to date me. We got along 60% of the time and other times we argued. It was really about childish, petty things that he started. We stopped talking to each other several times and he’s always been the one to do “dumping.” We’ve been in contact since the beginning of this year but every now and then he hits me up randomly. We end up arguing every time, it gets so brutal... verbally. He sometimes did this thing where he starts an argument but it’s really to get me to dump him so he doesn’t have to but later on he comes back a victim. I get blamed for his disappearance and other reasons behind it.

There’s no valid reason for us to argue because we weren’t in a relationship, never were. The last time he tried to call me, I told him that we should stop seeing each other for good and he was fine with that then changed his number. I’m not sure why since I’m never the one to break no contact. I’ve never fought with anyone this bad not even with my real exes.

It doesn’t feel like a situationship or whatever you want to call it, it feels like a divorce with 4 kids with him.

Why do we argue like a married couple?
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