Well thank you for all your answers, I think that "Almost lover" song is quite an option, thank you Gotdance882!.
But now I´m needing a song about that common situation of knowing someone over the internet. You get to know the other person, the other person gets to know you and maybe get some kind of interest in you. It seems like it could be something important there ... but... when you meet him by person , he is so much different that that image you have built. And, in the same way, you are different of that ideal image he have built of you.. so.... all that illusion breaks apart.
What song could describe that?