Amicable Separation

I've just recently had an amicable break-up with a friend. Two years ago I e-mailed her twice and she didn't reply, then just recently I decided to get in contact with her to find out why she's ghosted me.
She told me it was because I said some really negative things during my e-mails, and that in that current e-mail my tone was negative still. I took a look back at those e-mails I sent, then the most-recent e-mail and discovered she was absolutely right-I was a real piece of you know what. At the end of the most recent e-mail she said she'd appreciate it if I didn't contact her again, but I couldn't help but send one more e-mail-a huge apology for acting like such a selfish fool. She really appreciated my apology and said that it meant a lot.
I still feel so bad about it. I allowed issues pertaining a lack of communication to destroy a good friendship that I valued so much. I can only say that I am at least glad I did the right thing and that I closed the book on our friendship with something that correlates with what I stand for as a man.
Anybody been through anything similar and cares to share?