My Dilemma...

I could be in trouble.... I've noticed in the last few weeks that I've started to develop feelings for someone who I talk to online... Ordinarily, I probably wouldn't think a whole lot of it.. I might tell the person about it, I might not.. depending on how well I know the person.... the problem here is.. although I've been talking to this guy for a while, a year at least... I really don't know a whole lot about him.. he knows a whole lot about me, but that's because I tend to talk about myself a lot.. *L* The things I don't know about him are many.... I don't know his name, where he lives (I know it's on the Island, but that's it), where he works, what kind of car he drives... I do know that we share a lot of common interests... same music tastes... and he has a vivid imagination... So.. my dilemma is this... should I sit on these feelings, and see if they go away, as they often do.... or, should I let him know about them.. and see where things go from there?? What should I do??