Why is the majority against going back with an ex?

I dont get why the majority are against going back with an ex
I mean not every situation/break ups are the same
Every time I see questions involving an ex.. people get pissed off and saying shit like "never go back with an ex" etc etc
I've seen couples that goes back with their ex and still working
Why is the majority against going back with an ex?
Why is the majority against going back with an ex?
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