Definition: to have a secret sexual relationship with someone who is not your usual sexual partner Level: B2
她发现杰里米一直在欺骗她。
She found out that Jeremy had been ___cheating ___on her.
我背叛了我的男朋友，和我在度假时遇到的人有染。
I ___cheated ___on my boyfriend with someone I met on vacation.
如果你背叛你的配偶，可能会破坏婚姻中的信任。
If you ___cheat ___on your spouse, it can destroy the trust in your marriage.
