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be unfaithful to a lover or spouse
She was two-timing on me so we broke up.
她脚踏两只船，所以我们就分手了。
cheat on 对...不忠
我的妻子有外遇
My wife is cheating on me.
My wife is two-timing.
My wife is secretly dating someone else.
My wife is having an affair.
two times 两次
twice 两次