Is this long distance salvageable

Okay, I have been in this long distance 21/2 years. He wrote me a break-up letter before last Thanksgiving. We live 600 miles from ea. other. He said it's just too hard living so far. I am willing to move down there but he doesn't ask me to. So I quit contacting him. He kept calling and I would be polite. We would talk every 4 or 5 days. Then before last Christmas he picked up the pace and sent me photo's of him and more calls came in. Anyway, he just showed more interest again, long story short. Then I asked him if he wanted to come up here and he wasn't sure, but he came up for New Year's. SO we had a fantastic time. Then he went home and called me every day until the week-end came. No call Friday or Saturday. The only reason I bring that up is because after he broke up originally, he didn't call on Friday or Saturday nights I noticed. So I called him up on it and he said he just got busy. Well the next week end came and he called Friday at 7 pm and said he was going out to eat and look at cars. Then no calls after that. I tried calling him and his cell was turned off. At 10 he had it back on and finally answered the message I left at 20 min. to 11. He said,"Oh, my cell was in my pocket, I don't know what happened." So he said, "What do you want to talk about?" Well, I just asked him about the relationship and him coming up here and all. I said I still wanted a committed relationship. I asked him if he was dating or wanted to and said something like, "There's no one to date." The next night he called me at 8 pm and talked a little and said he was tired. I said I was too. He said he could not sleep the night before because of our conversation. I asked him if he had any thoughts about it and he said, "I am tired. I don't need more problems, I have enough problems..." SO we got off the phone. What the heck! I have been through a lot with him. It's 2 days letter and there has not been any contact. I am utterly tired and confused. Should I say we are done or what? And if so, if he tries to come crawling back should I let him? I need some experienced help here. He says it takes him a long time to commit but what am I supposed to do here. Should I answer his calls in the meantime. Really despite all this he is a good guy but he says the distance is the problem and yet he does not seem to want to do anything about it. Please help! Jan