Why can't my ex even look at me?

My girlfriend dumped me one month ago, it was a 2 month relationship and I was her first boyfriend. I'm 90% sure that she has moved on, as she told me she really wanted to be friends yet she hasn't contacted me at all in the 1 month we've been apart. I deleted her from facebook and she found out (because I re-added her 2 weeks later) and she was really pissed off. We've been seeing each other in that 1 month with our mutual group of friends, but things seem really tense. Like tonight, she was fine with chatting with my friends and taking the p*ss out of them (bumping the pool cues when they were trying to take a shot in pool, saying things like "wooooah your so good" sarcastically of course)

When I was talking in front of everyone, I could see her looking at me in my peripherals, she laughs at the things I say, exept she can never look at me face to face and doesn't do the things she does with my friends. I just don't understand it, she dumped me for being too clingy, she made it really clear she wanted to be friends, its been a month since we split yet she can't even look at me. Also when she left, she said goodbye to everyone, looked around the room at everyone, exept she didn't extend her head far enough to look at me, why do you think its so tense, does she hate me that much that she can't even stare me in the face, I mean, she dumped me, she wanted friendship so why is she acting this way? I do still have feelings for her though and I want her back...but she doesn't know this because I have hardly spoken to her.
Why can't my ex even look at me?
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