We all do things we desperately wish we could undo. Those regrets just become part of who we are, along with everything else. To spend time trying to change that, well, it's like chasing clouds.
Entirely incidentally, a little-known fact about Shakespeare is that his father moved to Stratford-upon-Avon from a nearby village shortly before his son's birth. Had he not done so, the Bard of Avon would instead be known as the rather less ringing Bard of Snitterfield.