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.