impending heartbreak?

My almost 6-month old (relatively new) relationship is on the rocks. I can see it crumbling. It’s just an “Any day now…” kinda thing. And all I can do is sit around and wait to see what happens. I don’t have anyone to blame for it…not even circumstances. I don’t have anything to say. It all started about a fortnight back. That’s when we last talked. I haven’t mentioned this to anyone coz I didn’t wanna sound pessimistic. In fact, I didn’t think about it much at the time either. Since the past 15 days or so JT and I have been unavailable to each other. I can’t take his calls when he calls and vice versa. All we’re doing is exchanging voice mails. The signs showed themselves much before that. We used to talk for 2-3 hours everyday before school started…then it became 2-3 hours a week…and now its…nothing. In fact, now its worse than nothing…for 2 days we haven’t even called or left messages.
I could probably sit him down and talk it over. After all, good communication is the foundation of every relationship, right? Wrong! I know that its just gonna be a whole lotta mud slinging….it will probably make things worse! (“Yes, but I returned your that time remember? And when you called that time you didn’t leave a voice message. And what about the time you didn’t take the flower delivery coz you were not home. And what about the time you said you would call but you didn’t? Don’t you know my cell phone loses signals when I am in the Lab and that I turn it off when I’m in the library…that’s why I cant take your calls! It’s you who doesn’t have the time you take my calls and now YOU’RE telling me its MY fault?”). And those statements will repeat themselves both from my side and his. But there are 2 more reasons why I am not in the mood to talk about all this. (1) I don’t want to make a promise (to talk often) coz I know I can’t do it. And neither can he. We’re both students, it’s a long distance relationship (West Coast Vs. East Coast), there’s a 3 hour time difference, we’re both immensely into our work and studies. We can’t meet often…so I am starting to have doubts about this working out! Coz if and when we get married…its gonna happen after an year…how long can this go on? More importantly, how long can we put up with this? And Reason (2) is…Things haven’t been so smooth of late. There’s been an undertone of stress in our relationship. That’s primarily coz of the unwanted interest of his sister and his parents. I can’t deal with that very well. They want to talk to me every second day…saying the same things over and over again.
Maybe I am wrong. Maybe I am the bad person…but I DO know what I can/cant handle. I DO know when things are working out and when they are not. And I DO know that my time and effort accounts for only 50%!
I don’t want things to fall out…but I don’t know what to do. Like I said, all I can really do is wait and watch. A relationship that isn’t going anywhere won’t end up anywhere.
I’m blue…I think I need to think about this…maybe rethink it as well.