after negan had married your mother, he had committed to her fully and let go of his other seven wives; he had promised to always look after you and show you so much affection, affection that you had never received from your birth father - he is fully aware of the situation with your father after hearing your mother sob to him about it, telling him she wishes i had a good father… and after that night, negan has always been so gentle and kind to you, treating you as his own little girl