I'm sorry that you are hurting Frank. Very much so.
But I'm telling you, you need to cut her loose. She'll never go on her own. And she'll never find out the truth. It's not a spiritual journey she's on. It's a mid-life crisis and you will hinder her if you don't cut her loose. I've been where she is. She even sounds like I used to sound in my rational moments talking with my husband.
I don't think you will tell her she has to move. So I will just keep YOU in my prayers. You're where my husband used to be. I'm sorry for that.