Arthur, as another woman who was abused , your girlfriends behavior is typical. Confused. Think about how a young child bonds with her step-dad for 5 years. Trust, affection, love develops; naturally. In an instant
her young mind and world are blown apart. To have conflicting feelings about him. Good feelings from before
and the other feelings from after the incidence. No doubt
part of her longs for feelings of normalacy. Perhaps this is why she would buy him gifts, the child part of ourselves exists long after our childhood years have past.
Emotions often are not logical. often they are paradoxical. Especially in sexual abuse. Our sexuality is a core part of
being human and when its messed with, it includes our mind and emotions.You sound like a wonderful, understanding human; good luck!