To me, this song is about a guy who is always sort of staring at the girl (or guy), across the room but is too nervous to actually go up and ask the person out.
But after spending so much time dreaming about the girl/guy without even talking to them, the main guy is too scared that the girl/other guy won't live up to his dreams and he doesn't want it to end badly. He's built up this perfect image of the girl/guy but doesn't want to take a chance that s/he will say no so he just continue staring from afar.
To me, this song is about a guy who is always sort of staring at the girl (or guy), across the room but is too nervous to actually go up and ask the person out. But after spending so much time dreaming about the girl/guy without even talking to them, the main guy is too scared that the girl/other guy won't live up to his dreams and he doesn't want it to end badly. He's built up this perfect image of the girl/guy but doesn't want to take a chance that s/he will say no so he just continue staring from afar.