One-itis
When a guy devolopes infatuation with a girl he is not involved with, or maybe just a friend thinking he is in love with that girl
Example:
I love that girl, i think she is the most beutiful girl in the world. She is funny, loving and I just want to be with her for the rest of my life, to bad she doesn't know me...
I love that girl, i think she is the most beutiful girl in the world. She is funny, loving and I just want to be with her for the rest of my life, to bad she doesn't know me...