How about this:
Hey you, I'm sorry about reacting the way I did when we last talked, I know it wasn't necessary and I appretiate your thought. I know that sometimes people just aren't good for each other and love alone isn't enough. But I'm thankful that I met you because you gave me the courage for a lot of things like going to New York to chase a crazy dream or finally breaking free from my parents.
I'd like to catch up sometime, especially because I don't feel good about the way things ended and eventually it would help us both to find our peace.
Hope you are well.