Help Dealing my pive-agressive boyfriend!?

I'm at my wits end trying to make things work with my boyfriend , who by all means seems to be pive aggressive. If he is upset at something I do he will still say things are OK, never gets directly angry, acts like things are OK. etc... I ask him if I've done anything and he says "nothing hun, things are OK"He has even told me that he has never gotten upset with anything I have done but then later on takes covert shots at me or cuts off all contact with me (blocks me on msn,won't respond to my messages, or just plain disappears on me in general etc..)Sometimes for days or weeks at time with no word or explanation, right after he tells me "things are OK" between us and that he "loves" me.Then claims he didn't mean to just "vanish" with no word. One time when he disappeared on me for nearly 2 weeks, I questioned whether or not we were in a relationship anymore, and because I was pretty vocal about uming I was single, he accused me of being rude or nasty!?Then claims things are OK