爱上别人的英语短语怎么说

"Fall in love with someone else" is an English phrase that means to develop strong feelings of romantic love for someone other than the person you are currently in a relationship with. It is often used to describe a situation in which a person's affections have shifted away from their current partner and towards another person. If you are trying to express this idea in English, you could say something like "I fell in love with someone else" or "I developed feelings for someone else."