Sorry you are here but it is a good place to be if you find yourself in this situation. I recommend reading ALL of Sandi2's "Reflection" posts. http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2653323&page=1 Its all about how to deal with a WW. Get and read the book if you haven't. Go to counseling for yourself. Start the DB process. Work on your 180's and GAL. If your WW is depressed, she probably needs to address that. Is she on medication? As far as exposing the A to her, I can't tell you what you should do in your particular situation. Is it an EA or PA? My WW is in a PA and I confronted her and kicked her out of the house. I thought the A had stopped but found out a couple of weeks ago that it has still been going on. I've started the D process and intend to serve her next week. For me and my emotional health, I simply couldn't "wait it out." I'm moving on with my life. I gave her 3 months to get her $hit together and she hasn't so I'm done. If you are going to tell her you know, you need to have absolute proof because she will lie and deny it. And you need to know what you are going to do if you confront her. You really can't demand that she stop. She's got to decide that she wants to do that herself.
Me: 48 y/o W: 47 y/o Together: > 20 yrs BD: Dec '15, then S 2nd BD: Mar '16, then I filed for D April '16: started piecing