I am very sorry for your pain and for this terrible situation. I really encourage you to keep posting and use this site as a way to work through the challenges.
There are some amazing resources that you should read, re-read, again and again. Right now your daughters need your stability and attention. The less you pay attention to your wife's behaviors and the more you are able to "normalize" yours and your kids lives - the better you all will be.
Everyone keeps telling me to remember that this is not about me - so I'm going to pass it on to you / it's NOT about you. You have the capacity to transition through midlife and not lose yourself - your w and my h do not have that capacity.
Keep posting!
M-48/XH-48 M=25/T=28 years Ds-24,22/S-18 D - 3/11 A Day at a Time