I realized it's better not to dwell on my mistakes, or somebody else's.
Firstly it does no one any good. Mistakes are mistakes and nothing can be done, except to try not to repeat them.
There's no secondly. I think it's a bad habit to use the word 'firstly'. Like using the word 'pretty', eg. pretty nice. She barred us from using the word 'nice' even. Yes, she was a fastidious woman who held English and Literature close to her heart. Bless her soul. She would turn in her grave if she read all these bad habits creeping back in.
I can give more examples but that would take me away from what I was going to write about.

Ah, I was talking about mistakes. Spilled milk should remain spilled. No crying or remorse. Do you know how many of us just live in the past? I do. And it kills me. I am living with past mistakes, past ghosts in my life and everything that's supposed to be dead and gone is very much alive and haunting me to this day. I need some sort of mental exorcism to clear these old cobwebs. Help me God. What have I done to myself all these years? Is there hope, now that Time has literally run out on me?