他伤你最深却偏偏深得你心
[tā shāng nĭ zuì shēn què piān piān shēn dé nĭ xīn]
'Hurt by him most but still deep in my heart.' A somewhat paradoxical sentiment where despite being badly hurt, you cannot let go due to your lingering affection. Love isn’t always easy, particularly toxic ones, but it’s real emotion reflected in this Chinese idiom/nickname choice.