Well now I guess I take a different view of this. All of my romantic relationships have evolved from friendships and all have ended on pretty amicable terms (ie: This isn't working out, etc). So I on the other hand am pretty much friends with both my ex gf's. If it starts as a friendship and there is no real loss of trust, I don't see why that friendship can't continue. If you've got problems accepting that its not romantic anymore, well then maybe it wont work. I do think for most though its possible if your relationship is forged from a friendship to start with.