Chastity has no meaning to her. What she betrayed was just her first night, not herself... She loved him, but they had no future, so she had no choice but to leave. In the end, she loved herself most.
She was his first woman and the only woman he truly loved. After figuring out why she left, when she reappeared, he would not let go no matter what.
She is like a sister to him, and the two are so similar. The renewed warmth allows the two to help each other and trust each other to achieve the same but different goals.
Not just one person's hatred…