I was in a LDR with someone for close to 4 years. I know, not good. I was marginally aware of TRP and thought a lot of the philosophy rang true. Still, I was too embedded into a LTR to do anything significant about it and maintained my purple pill ways. The relationship was taxing at times, but I didn't mind the attention. She definitely had codependent issues and would basically text me constantly, call every night, text me every morning when she woke up. The constant stream of attention felt good. Really intense love. I tried not to return it so much and be aloof at times, dangling my attraction to her and rewarding it to her with good behavior. I didn't want to overdo things.

Suddenly, literally out of the blue, she says she wants to end things. I was shocked and asked questions but I knew instantly she was lying to me. She had said she always wanted to marry, start a family with me. This was a complete 180. Angry, I hung up the phone abruptly (the whole call to end a 4 year LTR lasted maybe 3 min.) and we haven't spoken since. I went straight NC and thought she'd reach out after a week or two. It's been about 5 weeks now since it all happened with no contact.

2 weeks pass and I find out (I wasn't supposed to find out) she was cheating on me with an old friend for a couple months prior to breakup. She had started up a sort of romantic fling with this guy, fucked him, and was like texting him now on the side while maintaining a relationship with me. She was looking to swing branches. She basically replaces me with this guy, who frankly is more alpha than me (bigger, taller, more friends, better job). They're full on dating now, though she still only has pictures of me on her FB while this guy has pictures of her all over his.

Yah, I know I dug my own grave on this. Only thing is, this dude CONSTANTLY supplicates her. Every day he has a different post about her and his newfound love for her. Blue pill shit all day long. I'm just basically ignoring her and trying to not fall over from the dizziness. My question is: Is this just a typical case of hypergamy that happens everyday, or was this chick mentally-ill and craving someone who would merely be an attention whore? Is the dude playing himself with all the attention he's showering her, or do BPDs require extra attention to keep their appetites stimulated?

Thank you for all advice and serious feedback, this subreddit is truly a godsend.

Edit: a word.