What is it?

Have you ever seen or felt something so amazing that you just have to tell someone about it? I think we all have. Everytime I see HIM I get this feeling and my heart beats faster. I feel normal around him. But when he's gone it feels like the world is going to end. I get really sad and lonely, especially at home. If I am in a bad mood no one can break it's curse on me except the look he gives when everytime we're together. His eyes shine brighter and he seems that he can't not look at me. What is this feeling? Love? Affection? I don't know but it's taking hold fast.