My ex and I still argue about the past and how our relationship went wrong even 1 year after breakup?

Anonymous
What does it mean if my ex and I still argue about the past from time to time and fight about the cause of the ending to our relationship that happened a year ago? Before you ask why we are still in contact, him and I have 2 kids together that we coparent so we are in constant contact and see each other all the time. We usually only talk about our kids but every once in a while, the past will get brought up and we will argue about who did what and what went wrong. Why are we still doing this?
My ex and I still argue about the past and how our relationship went wrong even 1 year after breakup?
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