你薄情我寡义

'If You're Callous, I'm Ruthless.' This nickname indicates an unwillingness to let oneself be taken advantage of in personal relationships; it reflects tit-for-tat philosophy. The owner is declaring if another person treats them coldly, then they won't hesitate to respond just as cold-heartedly. This portrays an attitude of protecting oneself from emotional harm but also suggests an equal capacity for coldness and a certain level of self-preserving hardness or guarded demeanor when faced with callous or indifferent treatment.