Since her main pleasure seems to be tormenting you the best thing you can do is deny her the opportunity. Work on a project in the garage. Go to the pub. ...... in a spare bedroom or the couch or the garage, whatever but don't bother with ...... with her. Let her know you don't want some pity fuck from her. If she acts contrite, let her know that "You know ALL her ways of manipulating you!" and it won't work any more!
If she asks for a discussion, give it to her. Tell her you want out and that any life would be better than this. So far you've seen well and good that she can be mean spirited. Tell her that her disinterest has caused you to become disinterested. All you expect from her is grief. Tell her you're tired of being punished for what her ex did. If she denies that then ask her what you did that deserved the treatment she has for you? Tell her she has succeeded in running you off and that her bitterness has made you bitter too! Let her know that even if she did say she would change, you don't trust her word. Her track record and behavior show you exactly the opposite. There's no sense in holding it in any longer. Let her have it!
Seriously, at this point, I foresee two outcomes. One, she wakes up and realizes she's overplayed her hand. She's so consumed with the ex and her piety that she's lost herself. She'll begin to see herself as unkind and uncaring. I give that happening a remote chance, unlikely! Two, NOTHING! Nothing changes. She carries on just as she has, oblivious to your thoughts or feelings. You'll get over it, you always do she'll tell herself.
Move yourself out of the bedroom. Start looking up everything you can on divorce. Find other divorced men at the pub. Talk to them. Get your head prepared for the task. I swear I'm usually the guy that wants things to work out, but I'm also that guy that wants everyone to come out a winner. Right now both you and your wife are playing losing hands.