Girl who I was smitten about and said she wasn't feeling it all of a sudden, is now in my friends event's group chat and I saw her at a nye party.

I tried posting the link to my post from a month ago but this sub doesn't allow it. So check my post history for some more context.

The last two weeks have been interesting/confusing. She was added to the group chat by a mutual friend who knew our situation which when I saw set off a lot of emotions. I messaged the person who added her and told him he should have asked me first. He said he was pressured to add her by another person and apologizef if it made me uncomfortable. That was nice but the damage is done. Because now I'm right back where I was after she ended things. I also want to find out who wanted her in the group chat bc that person doesn't care about my peace and if I'm being honest I think it's another dude in our friend group trying to get with her.

At the NYE party we acted like nothing ever happened between us and we talked within the group about stuff and we had small bits of conversation directly with one another even some laughs between us but it was all surface level. It was around a bonfire and there were instances where we were standing/sitting right next to eachother. I was debating asking her privately about why she breadcrumbed me on for two weeks but I kept it cordial. Maybe I'll do that some other time but honestly I just want to be over her. It was just so weird to me this is a person who was so eager to see me again and then all of a sudden not and now I have to deal with these same emotions everytime I see her again.

I get over people by taking them out of my life completely and I was fine for the month but now she's in the same events group chat so I'm going to be seeing her a lot more. I don't know how to handle this and I realize we only went out three times but we had sex twice and it's just awkward to be around a person who I was so intamant with and then pretend nothing ever happened between us now everytime I see her in person.

I'm obviously not over her but she obviously is over me. How do I navigate this? I was fine until she got added to the group chat and then I had friends reach out to me telling me oh she's going to be at the NYE party or like oh she was added to the group chat. It just should have worked out between us, everytime I see her I just feel like what's wrong with me that I wasn't good enough for you. I know that's pathetic and her not wanting me and breadcrumbing should be enough for me to move on but it's just hard.

Edit: I am talking to other girls and have been on other dates since what transpired but nothing compares to this girl for me for the reasons I outlined in my previous post I am putting her on a pedestal bc of out backgrounds/same friend group/etc. I just need to get over her.