The lez suggestion won't work, as Dezign is bi.
Dezign, don't mind the guys.
Here's what I think: It's okay to want to be friends with him. In fact, I've always remained friends with men of my past. The only exception was one who did some almost unforgiving things. But even in that case, I was angry at first and wanted nothing to do with him. However, as time went on, the sore feeling healed. We talked, and I would stop to chat with him at any time. The truth though is that people who genuinely want to be friends lose touch naturally because it was the relationship that drew them close in the first place.
However, in cases where the two breaking up were close/good friends before they ever started dating, it is no problem remaining friends and as close as before. The only exception is if some great injustice was done, then their friendship would never be the same again.
Yes, your bf like anybody else (both men and women) would be disheartened with the news if he really cared about you, as he seems to. He?ll be singing, "Is it a crime that I still want you, and I want you to want me too?"

Nonetheless, he having been your close friend prior to the relationship and still having feelings for you will be very willing to remain friends with you.
As for how you should tell him, it all depends on what you want. Do you want to close all avenues to ever getting back with him? If so, then cut straight to the chase: Tell him with no uncertain terms that it?s over. Don't sugarcoat it. Say it assertively and don?t bother to talk about being friends with him. He?ll make that offer himself. Or you could actually talk about that part some other time.
If, however, you?re willing to leave the door open for something between you two in the future, then sugarcoat your break-up. Tell him it isn?t feeling right; the attraction is absent. However, you would like to be friends with him like you were before the relationship.
Now, this should work, except if you did something terrible to him during your relationship. The only issue I have with your case is, why did you wait this long if you knew that you didn't have the attraction (i.e., weren't in love)? I mean, were you just trying to give it a chance, hoping that the spark would occur eventually? What were you thinking?