I'm worried that there's something wrong with the guy I love

I met a guy a while ago, and I can't stop thinking about him. I feel like I love him, but I don't think I know him. What if he is not who I think he is? I cry sometimes thinking someone is going to be with him or that he has a girlfriend. I don't know, am I too obsessive? Every time we talk though, it's like magic. He makes me feel amazing, but what if I'm mistaken?