The whole "we're just talking as friends" thing is a ruse. I've seen and heard this same line a number of times, and every one of them is a sign of romantic interest. She wants to move back to be closer to him.
It sounds like the only way she wants your marriage to continue is for you to give in to her. "If you love me, you'll move with me." "If you want our marriage to work, you'll do as I ask." She cares nothing for you or your position in this matter. You have made an attempt to save it by seeking counseling, but she wants no part of that.
The bottom line is she wants out, but she wants to be able to pin it on you. "You don't want to move back with me. You don't want me to be happy. It could have worked if you had done as I asked." In my opinion, from what I'm hearing, as far as she is concerned the marriage is already over. She just wants it to be your call so she can pass blame on you.
Hold your ground and continue in prayer.