Confused and lost

I think I'm bothered by someone who I've absolutely no idea about. And I get bothered by his online presence though I haven't met him in years. I've tried picking up a conversation with him, but he's extremely boring and the chats are super dry ( I don't think he's a boring person, infact he's so charming that I can't stop thinking about him😭) . Though the little things that comes out of him seems interesting to me, it seems he's no idea how to carry forward a conversation and it abruptly ends. And I don't think he's interested in me at all and I don't think asking out someone whom I've no idea about ( I do know things about him) is a very dumb thing and I know that. I'm in a phase of my life where I've crucial exams coming up and I can't mess it up at any costs.

How do I stop bothering about him? And I often feel he's "the guy"?

Can someone snap me out of the delulu back into reality. Anything would be appreciated.