What would prompt you to take someone from your past back?

I've always said, "Your ex is your ex for a reason." I've never thought it was a good idea to go back to something that broke. But I've seen couples recently go back and forth a few rounds before finding their equilibrium... and things work out.

What would persuade you to try again with someone from your past?

What would prompt you to take someone from your past back?
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