Find a good family therapist and start going on YOUR OWN... YOU walk the bridge first to set an example and show her its worth while.. she is NOT going to go if you don't LEAD by example...
You don't talk about MWD, find a good Family therapist.. I assume you are in Ontario?
You can print up articles about family therapy, the harm that divorce does to children, ALL the research you want HER to do, YOU collect it, and scatter it in your home in your work areas...
Do NOT push for divorce... you tell her its THE LAST OPTION you will accept ...
You tell her she can cheat and destroy her family but you are NOT going to follow suit, you tell her you made a commitment and you are KEEPING IT... DESPITE her childish behaviour...
Proving an affair?
You confront her. She will deny it... YOu ask her to show you her phone.. if she says NO, that's it, tha'ts all you need.. you ACT as IF she is and as if you KNOW... don't try to argue or negotiate her into ADMITTING she's cheating, she won't do it most likley... do NOT get into a debate about it...
You tell her you know. .. If she says she isn't.. you ask for the phone... right THERE... If she give syou ANY excuse you tell her OK, tha'ts all I needed to know.. and you show her the DOOR
Tell her you will NOT have your daughter around destructive behaviuor.. you show your wife the door and you and your daughter turn her away... that's it... do NOT get into a debate trying to PROOVE she's cheating.. it's POINTLESS
You get ready to expose if you haven't yet... have you contacted anyone?
Get a signature put together with a list of everyone you have exposed to... and their response