Just got rejected. She ignores me. Now what?

I just got a rejection from a girl I really like. She's special to me

and I am not thinking of moving to other girls just yet.

I am cool with rejection but I notice that she is trying to ignore me, is feeling really nervous around me ( can't help it, we sit next to each other in class), and is trying hard to flirt with other guys right in front of my face ( the guys are my good friends somemore).

So now what should I do? Be friendly? Start again and try to flirt with her? Ignore her? Avoid her? Flirt with other girls? Act like I don't care?
Just got rejected. She ignores me. Now what?
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