It's common to regret about relationships you aren't happy with. But it isn't a good thing at all! Unfortunately, you cannot erase a part of your life, and you should just learn to look at it as not a misfortune or tragedy but rather as something to learn from. Most mistakes in life can be corrected or used as a learning experience. If you have a hard time learning that attitude on your own a good counselor could help. If you end up building that sort of approach one way or the other, it will help you grow into a much happier person. Regrets are always pending on us and although never changing our past, they are bringing negative experiences into our future.. So do try your best to get rid of them!