The lying and the adultery are starting to make me wonder if this M is worth the fight any more.
Is she still carrying on with OM? I got the impression it wasn't going on as much as before - she was spending more time with you.
If she IS still being adulterous the you SHOULD go dark on her. She's in the 'having your cake and eat it too ' mode.
Don't let her treat you with disrespect. If you have to , tell her it's unrealistic for her to think she can screw around and still expect you to be her 'friend'. You can be 'friendly' but not 'friends'.
