You could be me, my H wasn't happy with OW either. I think your H is realizing that and beginning to question.
OW is pressuring, let her pressure you're not.
I remember going through the same things you are, "can't H see I'm the better choice!" and H going through his thing, not happy with OW, not happy period. They have to figure this out on their own.
I hate to say this, but patience, patience and more patience. Keep doing what you've been doing, living your life and being a fantastic person.