Should I ask my ex why he treated me badly?

Guy I was dating broke up a month ago. Reason was totally workable. After break up, I went no contact. My sadness comes in waves. While break up was amicable and he wanted to stay in touch as friends, he said few harsh things to me which I now recall every day.
I always treated him nicely and I feel like asking him why he treated me so badly. Should I do that?
I know not saying anything is probably the best idea but I want to hear opinions from people here.

Should I ask my ex why he treated me badly?
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