【俚语】

Cheater 渣男

【例句】

She doesn’t believe a cheater. She said — Once a cheater, always a cheater.
她不相信渣男。她说，一次是渣男，永远是渣男。

Cheat on sb. 对某人不忠

【例句】

She’s been cheated on for a long time and she doesn’t know that at all!
她被骗了很长时间，而她根本不知道！

Two-timer n. 脚踏两条船的人
Two-time v. 脚踏两条船

【例句】

She ended the relationship when she found out her boyfriend was two-timing her.
当她发现她的男朋友对她不忠时，她结束了那段感情。

Player 渣男

Playboy 花花公子

【例句】

He is such a player, can't you tell? How many times has he hurt you?
他是个十足的花花公子，难道你看不出来吗？他伤害过你多少次了？

Betray v. 背叛

【例句】

John has promised he would never betray his wife.
John已经承诺，他永远不会背叛他的妻子。