Oh gosh I can certainly relate to this story! I was involved with a similar man last year who did the leaving, returning, blocking, unblocking.
It really messes with your self esteem. That's why it helps to work on you with meetings, reading, posting on here, doing the steps, etc., to build yourself up so that you don't end up in another situation like this. Even a nice little spa day at home will make one feel a little better through this
I know what you you're going through is difficult.