We all have bad moments, bad days, bad phases in life. It's been said that everyone is the villain in someone's story - and sometimes we are the villain even in our own.
Hindsight is 20/20. We all have a view of the past, what we should and shouldn't have done, and how we can move on from here.
But we still have regrets. Things we wish so hard we'd paid attention to the first time, that we didn't. We can never go back, but we can learn.