"I've re-read this couple times now, and I think you're right. I am left with little choice at this point but to try this. I must act like she almost doesn't exist to me."
Backing up a bit. You said that this was the main problem with your relationship since you weren't good at sympathizing or being empathetic towards her. If I were you, I wouldn't go totally cold on her or else she will see this as you not caring as usual. You can be friendly but not overtly so.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.