The knife to the heart phrase. How do you know if that's true? I assume you haven't been intimate so you really don't even know if you could fall IN love with him. You have to love a personality before you can love-love the person. That "not IN love with him" excuse is the classic girl avoidance tactic. The girl (or guy, I guess, but that's much more rare) is too scared to make the leap so, inevitably, the friendship ends. Sorry if I'm coming off like a jerk - this one is just near and dear to my heart. Of course, it all ended well. But I could have avoided a lot of heartache if I had just made the other girl put up or shut up long before I eventually did.
So why not give it a try? Be a 21st Century woman and make the first move. See what happens! It can't be any worse than it is now, can it? If anything, at least you'll be able to say you tried.