Why does my ex not like when I bring up the break up?

My ex dumped me a couple of months ago and we are dating again. I don’t know the actual reason why we broke up or what made him come back. We still fight like we did before except I mention how he dumped me and left. He hates when I bring up the fact he dumped me and left.

Why does my ex not like when I bring up the break up?
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