I can't look at my ex in the face, is this normal?

Anonymous
She dumped me 2 months ago and we only dated for 2 months and I was her first boyfriend. I don't really know why she did it, firstly I heard it was because I was too clingy, then because I was too self-centered and many other reasons. I really cared about her though so I don't understand the self-centered part. Anyways I've slowly been getting over it, re-connecting with old friends, starting up sports again and stuff, but I just can't look her in the face. Went to a party last night and she was there. Since the break-up she has NEVER tried to initiate contact with me, I've always done it but stopped 1 month ago. I hadn't seen her for 2 weeks and when we caught eachothers eye it was as if someone punched me in the chest. Later on I found out my best friend likes her and that she likes him, so they're most likely going to date, I told my friend I was okay with it, when really I'm not but I don't want to stop them from being happy. Then a picture of her and her friends popped up on my news feed and she looked relatively happy, again my chest spontaneously grew 1000 times heavier. Is it normal, I thought I was going so well. I've come to terms with the mistakes I made and realized it wasn't entirely my fault and because of all the hurt and anger she has put me through I would not want to date her again.
I can't look at my ex in the face, is this normal?
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