Xiao is right, is not that you hate, is that it hurts, at least for 1 of them...we are talking about really loving each other like a lover, not that relationship that you end up being friends because you both realize that you are not in love.
Do you know any example of this kind of relationship ? cause i don't...even one of my sisters had a bf for 8 years...and she loved him like a brother after all that time, and now they don't talk with each other, since he was still in love.
And you have to ask your self, if they are still friends, will you be completly sure both of them are not in love? or one is still there waiting for the other to change his/her mind and find out that he/she is still in love....