Found out my crush has a girlfriend? Please help!?

Daretodream13
So there is this guy at my school who I really like and we're good friends and everything. Anyways I was pretty confident he's shown some interest in me (flirting on fb chat, sitting next to me in class, joking around with me and talking all the time, as well as just taking a general interest in my likes and stuff) well anyways I also thought that he liked my friend (though she doesn't like him). Anyways today I joked around with her and said "You and ___ seemed pretty cosy today." And she responded with: "What? No! We've known each other for ages its more a brother-sister type of thing. Besides, he has a girlfriend." Of course my heart dropped at that and I didn't know what to say. Also of course I wanted to immediately fb stalk this girl but I can't find any girl on any of his stuff on fb... Likewise none of my other friends who know him knows about any girlfriend. And recently in bio my teacher asked how many of us had boyfriends/girlfriends (it was for a class discussion) and only one person raised their hand and it wasn't him. Was my friend making that up as an excuse or was she just randomly saying that? Or is it actually true and he just hides it for some reason? And either way, what should I do? I really like him!
Found out my crush has a girlfriend? Please help!?
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