You W sound like me, she convinced herself that she was doing no wrong and we were having a amicable split, instead of her running off with OM.
It's also like they can't match their behaviour with their own moral or values so have to write a story in their mind to make them feel better about what they are doing.
Have strong firm boundaries, don't agree to tell the story her way. She need to see the consequences of her actions, she is in a dream world at the moment, where she can leave you to be with OM and she has done nothing wrong.
Above all do not trust her, she is like an addict, OM is her drug! The only way this changes is if she suffer some form of loss and consequences to her actions.
Send strength and a big hug
Me: 40 W: 36 T21 M17 S12 D10 D10 ILYBNILWY EA happened. PA happened. June 2016 trying to piece our M and life's back together...