Moving forward

[Greek]

And I'm thinking of proceeding just with questions.

How was your time with (friend 1)?
I noticed you didn't take that food for her you were planning.
Did you see (friend 2)?
Are you having an affair with him?
And if she denies it, I will just say "I know what's going on."

Will you please stand up to this spoiled girl????!!!! Why beat around the bush? You KNOW where she was. I suggest this:

(Looking her IN the eye) "I know you were not where you said you were going to be this weekend. I have decided that I will not share you with another man. If you will not cut off all contact with OM, then I want you out of the house in three days."

You do NOT tell her how you know. You do NOT let her turn the discussion to how you know. That is NOT the point and you make sure she doesn't get to go there. You are going to have to play hardball with this one, I'm afraid.

She's probably going to bluster, call you every wicked name she can think of. Let her. That's not the point either. The point is in order to save your M - AND YOUR DIGNITY - she has to stop lying and cake eating. You are defining a boundary about her behavior.

You need to show your teeth and growl at her (not literally).

Greek