blast from the past

Not going to say much cause I don't think I have much merit to.
What I will say is that people do make mistakes and we all have a past.  We do things that become regrets and there's sometimes not a thing we can do to make it right.  

I have regrets, I feel remorse and I miss the past and all it used to be.  

Anyways.  Props if y'all remember him