Question speaks for itself. I am not talking about a clearly dysfunctional relationship before the breakup, and when either of the partners are a complete ass hole.
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but as you say it depends on the circumstances and why they broke up , like say they broke up cause one had to move away but had an otherwise good relationship and now they have moved back I'd say that be OK .
but if they broke up cause of cheating or serious issues it might not be a good idea to get back together