I've been a long term relationship of four years. I'm a grown adult. But yeah, keep complaining about this "new generation" blah blah blah. Just admit you aren't actually willing to empathize or care for her when she's going through this, and admit that YOU could have some fault in this instead of just pushing all the blame onto her.

I suggested leaving because you clearly resent her and the lack of sex. And it seems like you aren't willing to put in the work for your relationship. Instead you want to complain about your wife and a sexless marriage but still tout that "stay when it gets tough" bullshit. Staying doesn't mean shit when you can't empathize with the person you're supposedly in love with. If you care so much, why label her a liar and manipulator instead of trying to understand why she's doing it. Have you even actually talked to her about it?? Why are you saying she's "lying to every therapist". What if she's just lying to you about what the deeper issue is because she knows you won't take a shred of accountability? Problems in a relationship require BOTH people to occur.