I still care for my ex.
What went wrong that caused your relationship to end in the first place?
He was crazy when we dated.
If you were having problems with your partner while you were dating, then it was okay of you to break up.  You can still care for this person as a friend.
I just wish I didn't get myself into this
Then years from now you'll have that one regret hanging over your heard because you didn't take that chance with that person.