“出轨”用英语怎么说？

1.Cheat on somebody:

　给某人戴绿帽

　　例句：

　　She cheats on her husband.

　　她给她老公戴绿帽。

2.Have an affair with somebody:

　跟某人有暧昧关系

例句：You have an affair with him.你和他有暧昧关系。

3.Two-time:对(情人或者配偶)不忠

例句：　Are you sure he's not two-timing you?你肯定他没有背着你另有所爱