Maybe I also need to detach to start preparing myself for the worst.
If H is openly having an affair and planning a weekend away with OW, then I would say the worst has arrived already.
If you've already shown him a more passionate side of yourself, and you're making non-sexual changes and demonstrating them through action, then I would say the time has come to detach until OW is gone.
Accuray
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015