Ghost, you still let your fear control your actions. You think trying to have good conversations with her now is going to make her want cohabitation when really it will make her want to sell the house sooner so you get the idea it's over. You see how the fear controlling you is contributing to it happening?
I'm sorry, I know how hard this is but let go of trying to make things more pleasant between you both. Your just delaying the work both of you need to do, the work that might actually contribute to you two comming back together.
Accept what is, let go of what was, and have faith in what will be