Hey Shortie I think out of everything you wrote, this is the most pivotal statement:

"I want nothing more than to go back and help him as I always have but I know it won't be good for me."

Bottom line is, you gotta look after yourself right now - if it's not good for you, you probably need a much needed break.

If I were you I'd send him a polite text and tell him you need to sort out some things in your own life; and in the time being; unfortunately you need to block him on your mobile. I'd possibly say it won't be a "forever" block; and when the time is right for you; you will make contact with him, at some stage ...