Why does nobody believe that you can be friends with an ex?

Why must you always lose contact or let everything go if that person was such an important part in your life?

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+1 y
For instance my mom and her previous husband were still good friends even after my mom remarried and even after he had his partner and they could be civil about it yet everyone says it doesn't work out cause one can't be friends
Why does nobody believe that you can be friends with an ex?
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