Sorry too lazy to scroll dow nto see who posted it, but whoever wrote that they have had a best friend for 6 years and have strong feelings for them, I say discuss it. Not come out and say look I love you, lol. I mean I was in the EXACT same situation. Me and one of my closest guy friends, we went out, talked on the phone for hours, etc. Everyone else said we ACTED like we were "together" and that it seemed natural. Well I had nary a clue as to how he felt about me, but slowly we both kinda broached the topic of what it would be like if we were more than friends. It started out like "ha, ha, so-and-so thought we were together...would it be weird if..." and eventually we found out we both felt the same way.
In the end we agreed that it would be better for us not to test the waters and potentially ruin a good friendship, but it feels much better to have our feelings out in the open. Also, a little sexual tension/flirtation never hurt anyone!