Do dumpers ever regret walking out?

I'm certain that this has been asked a trillion times but I'm curious.

Assuming, even, a few years roll by and the dumpee has spent time redeveloping herself, working on her faults, and just gaining in life experience is it possible for the dumper, once so confident in his decision to end it at the time, to later round back (maybe befriend the dumpee) and to find that maybe the grass wasn't greener?

I'm just curious. Some people have said yes, others say no. If there ever was once a spark, can it come back?

Do dumpers ever regret walking out?
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