Why is my ex acting so weird around me?

Anonymous
We broke up around 3 months ago mainly because she left for college and couldn't make time for me. I was upset but moved on. She started seeing another guy in her college and we had a few months NC before she contacted me with general (friendly) chit chat. We met up a few weeks ago at a mutual friends party and she was with her b/f. She was acting really weird around me often distant but then I would catch her looking over at me. I figured maybe she was uncomfortable because her boyfriend was their so gave them space. A few days later I had a text message from her (again idle chit chat) as if all of a sudden we are friends again! She is home for the holidays and I saw her last night in a bar where we all used to hang out.

She was without her boyfriend but was still acting weird like she is really uncomfortable around me. I don't get it. She acts normal when she texts but is like a different person face to face. If it's because she still has feelings for me then why break up with me in the first place? Or start seeing another guy for that matter! Our split was friendly and I am not doing anything to make her act so awkward around me but each time we see each other the tension feels as if its growing. What should I do? I still have feelings for her but she was the one who dumped me and found another guy so I don't feel like it should be me who should be doing the chasing!

Why is my ex acting so weird around me?
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