Why is she acting like this? Has my ship sailed?

She's the popular girl, the one who gets 200 likes on social media but still a great girl. I'm the drifter not drawn into that fluff. We've been to and fro'ing for a few months now. At a party the other day when she walked in, I could see she was eyeing me out and came up and was all over me. I reciprocated but walked off after a bit as I found other friends who had turned up (there were others around her but). She has a guy friend (the guy is a friendzoned crusher of 2 years) I found amusing who was ignoring me more than usual throughout the night even though I was trying to be pleasant.

And with that the whole mood changed. Later She started ignoring me. I noticed her female friends flock to her and they were discussing. I overheard her talking about how she must not be my type or something. From there, the flood gate of male attention opened and she was flirting with every guy at the party. I'll admit I got jealous but I carried off on my own and walked away and had my own fun.

These last few days have been interesting too as she is normally a once every couple weeks poster on social media to multiple times a day.

I think that night really released my inner feelings for her and I don't know why I stupidly walked away. My social skills have been lacking since I've turned around my life; focused on my goals studying, got super lean and trying to start up my own business so I haven't had time to date or chase nor have I been that available for such social things.