Call me delusional if anyone wants to you are delusional , but I dont think she really wants to be there what's the reality? ,but see's it as her only option right now mind reading . She CANNOT support herself or the kids no she has a job, admit it , and the prospect of seeing her twins all the time ( as opposed to 1 weekend a month when we were together) being dangled or used as a lever how about she is having an affair and wants to be with this guy instead of you , combined with her feelings about how much I hurt her made it "tolerable" in her mind, at least for now or at least as long as you keep your current thinking up .
If you truly want to understand your wife stop thinking like a man. Until you understand how and why she feels the way she does you will remain stuck.
I know you are trying. Change your thinking, promise it will help you.
Cheers
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.