It would just be a hell of a lot easier if she would just snap out of this and grow up.
Don't count on it (although it is known to happen). My W and I are heading for a separation/divorce and she is still doing the hot/cold thing. On Saturday she said she didn't want to do any family things with the two kids and us together because it wasn't real and was all fake. On Sunday my kids and I were going miniature golfing and she asked to join us. So they move from one side to the other continuously. It's your job to be steady and not follow her back and forth.
Focus on you and PMA no matter which mode she is in. If she gets pissy and cold you don't need to do the same - in fact, make sure you DON'T do it. You control how you are going to act. If you allow her to push your buttons with her attitude you will be surrendering your control over to her.
MySitch Me-47 STBXW-41 D-5 S-8 ILYBNILWY-01/08 Want a D- 01/09 Physical Sep-01/10 D filed-06/10 Got 50% custody=09/11 Ride that wave!