Not going to bore you with a wall of text but here's the summary:

Had been plating a girl for six months, but told her from the start not to get emotions involved, feel free to see other people, leave if she didn't like it, etc (stupid words, I know). I never treated her badly, and honestly would've liked a LTR with her as she is good material for it. Got dumped a month ago, she said she had been feeling uncomfortable for a while, started ghosting me and seeing someone else, who she's now serious with. When she broke it off, I acted like a complete beta fuck, forgot all my RP lessons and now I'm trying to regain composure. I even sent her a merry christmas text which didn't get a reply and feel like shit about that.

My questions are: how do I reconcile with acting like so BP during this breakup? Is there anything I can/should do with her? How do I move on mentally?