What does it mean to be civil or cordial with an ex?

My ex (who dumped me) is constantly complaining about the fact that I unfollowed him, avoid him, and when in a group setting with mutual friends, I don’t really engage with him like I used to.

We agreed to be civil and cordial around each other. To me, this means not hostile or rude. I don’t know if I’m missing something or what.
What does it mean to be civil or cordial with an ex?
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