both forms are right. 1 Why DID you lie to me? refers to something I did in the past - probably a single event. 2. Who DO you lie to me? that is an accusation. the asker has noticed that I lied on many occasions in the past and has concluded that I always lie. Hence the question WHY DO YOU {always} LIE TO ME? If my gf ever asked me # 2 i would either lie (HAHA) or tell the truth (but then, how would she know which one was the lie since she thinks i {always} lie????? Hope this helps.

Yeah....that's right..... But we usually say "你爲什麽騙我？"

that's right....

是对的

Hey, Sure,you are right!