It seems to me that he's not ready to be a fiancé.
You've had a rocky relationship all the way through. You've been engaged for 8 weeks, 1 off which he hasn't at all spoken to you.
He always "attempts to break off the relationship".
He told you he had a fight with his Mother, I am betting "over" the engagement.
Any one in love doesn't stalk face-book to see if the other person appears "ok" or not, they get their butt over to the other person and make things right. I don't believe that you even are in love with this guy.
I don't think either of you are suited to be honest and that his Mother has told him as well, the same thing and he has doubts.
I think you should have doubts.
Both sensitive, therefore constant arguments, non trust, non communication, as others have stated, does not constitute a good relationship forging forward to a marriage.
Perhaps you should really sit down and do a list of all the positives and all the negatives about your relationship, things you wish you had but don't have within the relationship, if you can consider, same on his side and truly see where you are sitting.