Hey Core - sorry you're having a rough go of it. That's to be expected on the emotional rollercoaster.
You're main job here right now is to protect yourself and your kids. W isn't the person you knew before, and she is going to be making all kinds of weird decisions and acting strangely. This will happen for quite some time. So your goal is to get yourself as emotionally strong as you can and be the best dad you can to your kids.
That's why I highly recommended not snooping anymore. What good is it doing you? You already know what you suspect is happening or happened already. So let it go. W is going to do what she wants, she controls her behaviors, you control yours.
The best thing you can do is focus on yourself and your kids and leave WAW to her own drama. Getting a life for yourself is very important - it will feel weird at first but the more you do it the more you will get used to it.