I can't stop crying, someone help?

I really like this guy, so much. And believe me when I say I don't get like this. It's oh, so rare for me to care so much, especially this much. And this guy is near perfect, for me. And I care so much about him and I want to tell him but idk what he'd say and that's what scares me. I don't want to make things awkward between us if he doesn't like me. And I'm overwhelmed by my emotions that I just broke down crying. I'm not used to feeling so strongly toward someone and I don't know how to handle it.... Help... do I tell him? Do I keep holding it in....do I try and let it go?...