I've been following your thread and you've got lots of good people giving you great input. It's hard when a R ends, even harder when you the end takes you by surprise. Did it?
Sounds like you need to find closure with this. Did you have closure with your M when it ended?
Quote:
I know the things I would have done with you and for you if I hadn't been tired, frustrated, and preoccupied
At the time of your R, you were not available to it?
Sometimes all you can do is acknowledge what you learned from the situation and take it with you. Of the things you mentioned, do you think they are things that need to be or have been addressed within your life? Make changes for you. Maybe this R was a chance for you to prioritize your life, figuring out things that weren't working. Every interaction we have with another is a chance to learn about ourselves.
R's change our lives. I have friends who, after a break up, make themselves busy. Yes, we all need new activities to help us heal, but there is such a thing as too busy. Sometimes you have to sit in a room all alone and enjoy the company.
I hope you can find peace with this situation. The peace is within you. Don't stop until you find it.