Hm, I disagree with Redpepper on this one. Polyamory aside (and you don't say you ARE poly, right?), what is it that YOU want? Do you want to pursue a relationship, even if it's just fuckbuddies, with your friend? If you do, then it would be a good idea to talk to him and let him know. If he's poly and in another relationship, it's HIS responsibility to talk to his partner and figure things out, not yours. I don't see that you did anything wrong since it was spontaneous and no one had defined any relationship boundaries beforehand... but you may end up feeling hurt if you aren't honest with yourself and with him about what you want/need.
Last edited by geminigirl; 11-23-2010 at 10:37 AM.