If you split up and have kids, do you try to be civil with you ex?

Would you let sleeping dogs lie, even if it was a bad break-up, or would you have to poke the bear all the time? I know some couples that separate/divorce and they get into it every time they talk on the phone or meet to pick up their kids. I feel sorry for the kids, you can see how it affects them.

If you split up and have kids, do you try to be civil with you ex?
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