I feel unmotivated

I feel unmotivated in school at the moment and in my relationship. Right now I'm in a long-distance relationship and we've been arguing for the past couple of months constantly. He says that he feels that we're going to drift apart permanently and not work out, which utterly makes him disappointed since he loves me and wants it to work out, and he's trying to fix it but I'm not putting in any effort. He says that I am the only thing in his life worthwhile and without me he has nothing. (This is probably due to the fact that he dropped out of university, etc. He doesn't seem to care about the rational in life.) The thing is that I have developed feelings for another, but I still love my boyfriend, even if just as a friend. He has been the best friend of my life thus far.

Should we just end it and never speak to each other again? I'm not naive to believe that friendships can last afterwards, especially since this is long-distance.

I'm sorry I know how rough it feels, I've been there myself. Ideally you'd be able to break up with the long-distance boyfriend but still stay friends, but it never works like that!
Umm. Yeah. If you really don't feel strongly about him any more and there's someone else you like, the sooner you break up the less painful it is...

Well it is apparent to an extent from your post that you want different things in life - do you really want to be with someone like that?

If he wins the lottery, yes. But in all seriousness, I can't see it realistically working, but he is my best friend. He knows me inside & out.