ayahsuhnice
I dont know for sure but i think its possible to fall in love like you describe. The problem is that it seems he has a girl already but the biggest problem is he doesnot love you. Its such a fine feeling to love someone but might be best to let this one go for now.
As the others have said, you need to learn the meaning of the word "love" before you throw it around carelessly. What you have is an infatuation with this boy, and since he is with someone else then he is not available to you. Don't be one of those morally questionable girls who chases after a guy who is already taken because everyone hates a homewrecker.
Agree with the above posters.
You can't be "in love" with someone you've never had a conversation with yet.
You're in love with being in love. You've created a persona that you're in love with, and this guy is it.
He has a GF, and you claim to be in love with someone who ignores you (AND has a GF). I think you're confused about what love is, this isn't it. You cannot love someone who is in a relationship with someone else, and who has only looked at you.
I'd suggest figuring out why you've come to these conclusions, as they're not healthy.