I think i was using my ex as an emotional crutch to help me through college (we were together two years) and i had a very similar crisis to you ie fancying a couple of mates - it took me months fo figure out that this is what i was possibly doing and i still don't really know absolutely for sure, but I figured i love him, even if its just as my best friend, and split with him because I didn't want to leave him hanging because of my issues. I needed some time to get my thoughts in order and get me emotional independance back and I couldn't do that with the safety net of him always being there for me.
Since then one of the guys i liked has turned out to be a really really great pal.