My crush thinks I like someone else and I'm shy. What should I do?

So I have a serious crush on this guy that I am in school with. I've seen him looking at me in class, we talk online and in between classes a lot, and I feel like we have a lot in common. The thing is that today in class I was on Facebook emailing a friend and saying thanks for getting me the phone number of another mutual friend. (My phone died and I lost all of my phone numbers, but I didn't write that because my friend knows what happened.) However, he (the guy I'm crushing on) totally saw my screen. (I know he could read it because he commented later about the game I was playing.) Now I think that he thinks I'm into this other guy. I'm not sure what to do. Obviously I could be direct, but I'm really shy and I only think that he likes me - I'm not sure. So what do you think I should do?
My crush thinks I like someone else and I'm shy. What should I do?
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