Falling in love with your best friend or your best friend falling in love with you is a very common scenario.
It isn't surprising that you would fall in love with a friend. After all, that friend is already someone you like and with whom you feel comfortable. It is often someone you already spend a great deal of time with and someone with whom you have spent thousands of hours on the telephone. You know this person's likes and dislikes, concerns and deepest insecurities. And, this person knows yours.
So, what is the problem?
Well, first of all, these feelings are not always mutual. The friend may want to remain just that/a friend. There is also the discomfort that occurs when the other person knows you feel "differently". Oftentimes he or she feels guilty or maybe even threatened. Whatever it is that the other is feeling, it can become very complicated.
Once again, honesty is always the best policy. Even if it seems like being honest will mess things up, possibly even destroy a perfectly good friendship, it is always the best way to go. In the long run, you won't regret it.
I know of many times when friends have become girl-friend and boyfriend, and everyone ended up happy. But, even when the relationship thing doesn't work out, with honesty, the friendship can survive and even become stronger.
So...if you like your friend as more than a friend, hang in there. Don't ever give up hope. Things will work out...one way or another.