Really. It's of no use brooding over the past because in reality and not in the movies, we cannot go back and undo what we have done, so dwelling in the past might send us into serious depression or other mental health damages.
Just like it's not advisable to dwell in past, it's also not advisable to live in the future. Some people live in the future by worrying too much about it which leads to anxiety problems.
It's best to live in the moment, we cant undo our past, but we can maximize the moment to make our future better than our past.

Thanks for the opportunity. Nice Blog!