Gale is incomparably more open to the person he's romancing than to the friendly version of Tav. That's why his story is different from the perspective of romance and without. Only he knows what it really was, whether he felt like a victim during his relationship with her, or if he started to feel that way when Mystra told him to kill himself. For me, the whole story is twisted, not just Mystra or Gale himself. A combination of circumstances caused something strange and hurtful.Mystra doesn't have to be evil per se, but with a mortal who is a genius of magic, the whole arrangement makes both her and Gale "corrupt".
