Is it healthy to stay close friends with an ex in a new relationship?

If your partner is still close with their ex, would that be a dealbreaker for you? Or does it show maturity if they ended things on good terms?
Red flag _exes belongs in the past, no exception
It depends _ has long as strict boundaries are respected
Select gender and age to cast your vote:
Is it healthy to stay close friends with an ex in a new relationship?
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