you ask someone out
they reject you
some period of time later they change their mind and come back to you
you reject them
Is this justifiable or childish?
Most Helpful Girl
Only justifiable if you don't like them that way anymore/moved on. If you still like them and rejected them only for revenge then that's petty.1
Most Helpful Guy
Perfectly justifiable (not that you have to do that in any way). It's completely your right to date or reject for whatever reason you want.
Just remember if they rejected and then came back to you, chances are you were/are not their first choice. If you're cool with that then date them, if not reject them.1