....done something really fucking stupid and realized - maybe at the time, maybe belatedly - that this was a decision that will haunt you forever.
So: 'fess up, shitheads!!
[NB - I realize that said regret may involve more than one of the above. Please be specific, you useless cunts.)
[NB no.2 - I also realize that non-marital "relationships" are absent from the list. Please improvise. This omission is due to my current state of mind whereupon one either simply fucks, or you get married and stop fucking. Thus.]