Prematurely called divorce busted, worse now

[steady]

Let her initiate the conversation. Unless there is some important information you need to discuss. Don't ignore her or have the 'screw her' thing going on inside of you. She will sense any hostile feelings or intent even if you never open your mouth.

Say good morning in the morning, say hello when you come back from work. Be polite - like Puppy said; Like you would treat a friend or a roomate. This is the mindset you need to achieve. It has to be a part of you otherwise she will sense it.