Unblock, block. Unblock, block! Why does he do this?

Every time he unblocks me and we start talking, we get into a fight and then he blocks me again. This has happened about 5,6,7,8 times. Last time we spoke was about 4 months ago and recently I noticed he unblocked me again. But i'm not playing games, other wise, i'd just block him and say good riddance! ..but knowing myself, i'd just unblock him later.. i dont know why hedoes this, (or I for that matter) especially when he's seeing someone else. ..and im so far away. :( should i just leave it be? or block him (and tryto keep it like that)? or confront him? or.....? help ^.^