Thanks to both responses so far. I appreciate the honesty and objective opinions. I can't force myself to leave her. I am continuing with individual counselling as well as couples therapy with her.
Yumeikui merry, you make a valid point. Looking back I almost dismiss the sexting as something meaningless. But as you point out, it wouldn't be meaningless to her.
I just hope and pray that I can get my mind straight and focus on her instead of focusing on what she has done.