I am glad to read this, my dear friend.
Your anger is justified.
If I may give a piece of advice, from personal experience. Delete the correspondence. It serves no purpose now, other than to make you question yourself and to be there to hurt you.
I know it’s hard to do. I’ve been there. It took a lot longer than it should have for me to go back and delete everything. But the hurt I caused myself by going back and reading it over and over wasn’t worth it.