Ah Yes! Regret..
I have it, but I don't let it get much 'head space'...Now.
I did many many years ago, and it nearly made me go crazy!!
The moment it comes, then I have to say.....too late!
At the time....the greater amount of people, will 'feel & think' that the choice they picked, at that time Was correct.
On reflection: Like myself, and mine is a huge 'one', it was not the right choice.
But, at that time I could not see ''the forest for the tree's '.
Freedom of choice......Free will.
We all at some time Will make a bad choice.
What we do with it, later in life is up to us...But! if we let it ruin or upset our lives, we loose full stop.