Guy friend suddenly mad at me, and I don't know what to do?

So I have this really great guy friend and we've been really good friends for around 2 years now. But yesterday he seemed really pissed off at/with me, and his guy friends kept glancing over at me. I'm pretty sure he's crushing on a very shallow girl right now who hates me and sees me as competition :P. She may have said something rude/mean about me to him, but I don't know why he would trust her over me! And before you ask, NO I do NOT have a crush on him! Do you have any advice for me? Should I confront him about it, or let it blow over? Have you had this happen to you, and If so what did you do? Thanks so much :)!!
Guy friend suddenly mad at me, and I don't know what to do?
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