Yes! forgive yourself and forgive others. Only when we realize that can we truly move on. Don’t hate the people who have hurt us. Learn from it and become better. I’m very happy for you!
I have also been through an extremely similar situation this year. The “How did you end up appreciating me so little? How did you?” sentiment hit so close to home. Here is the article I have written a mere couple days ago about my failed friendship, if you’re interested :)