We all have regrets. I regret not saying "I Love you" more. I regret my lack of intelligence in with those I love. All I can do is become more wise with those regrets for a life yet to come.
I now sleep in an empty bed because of regrets. But if I was to go back in time, all I'd change is the commitment I have now, that I did not have previous.
Learn by mistakes, its all an experiment.