My ex always said my reactions were under expressive or incorrect, why would a guy gaslight?

I was never excited enough, laughed at the wrong time according to him, and was always making me say I'm sorry for something I never said. When I tried to explain he would accept and then go back to the original issue. I finally just said, "goodbye" because I couldn't handle his bs. He was actually ruining my ability to think. What's going on with him?

My ex always said my reactions were under expressive or incorrect, why would a guy gaslight?
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