Life is full of regrets, but what is one thing that you regret the most? And if you turn back time, you will go back and change it?

I regret of not waiting for my ex a little longer and married his best friend who is now my husband. If I can go back and change it, I would marry my ex instead of my husband.

Life is full of regrets, but what is one thing that you regret the most? And if you turn back time, you will go back and change it?
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