He's not her usual type, but she fell for him after dating for a couple of months. He fell for her on the first date. to cheat on (somebody): to secretly have a romantic or sexual relationship ...

A phrasal verb is a verb that is combined with a preposition (e.g. in, on, with) or an adverbial particle (e.g. up, out, off) The preposition or adverbial particle extend the meaning of the verb ...