How do you deal with passive aggressive behavior?

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How do you deal with someone who has a problem with you when they make it known in a passive aggressive way? You know, they don't call you out on it but make it clear there's a problem? Also, can you give me some advice. I was talking to someone who currently lives far away on AIM. Lately, he's been all buddy buddy, but he's the type that when he wants to talk you have to talk and when he doesn't you don't. We had periods of talking and nontalking when he still lived in NJ. I'm semi glad he lives across the country now. Anyway, after a period of not talking, we started talking again in early September. It was by accident because I was blocking him on aim and I was having problems and had to allow anyone to contact me when a friend couldn't get through. So, my problem was fixed and I never changed the options and he ims me like nothings happened. We stopped talking for almost a year. So, I went along but never got to nice. Well, he starts being nicer and sending me emails and being all around thoughtful. He's also making it clear he has intentions to go out with me if he goes back to NJ, or moves to PA with parents, due the economy and cash problems. He was inviting me to his house, but I have no way of going there now. So, I tell him this and he was telling me wants to see me in NY either around this time or in Feb. Around 2-3 weeks ago, we're talking and out of nowhere he tell me I've become nicer because I stopped talking to him out of nowhere and when I did I was snotty. So, I let it go and say people change. I mean it more so that maybe he's changed. I thought he did for the better. Then, he informs me, he had me on block for a while and he regrets it because I've grown as a person. I let this slide and chat him up. The next chat, he's a bit kurt and informs me he has to go because he has plans to go out. Then, we talk two more times and he out right tells me he is going to clubs and he's been going to and doesn't know why he can't find someone. I then get an email sent to me that's between him and someone else have a "private" discussion. He writes me an email saying sorry it was an accident. Now, I'm turned off and glad I don't hear from him for like two weeks anf thinking of blocking him again. So, today I get an im and he is nice as pie and I'm almost thinking of letting it go. So we talk for two hours and he has to go. So, I say good night, whatever. He signs off only to sign on a few minutes later and ignore me. I think he did it on purpose. What do you think of this and why is he doing this? How would you respond? Sorry for such a long post. :(