Whatever gave you the idea (that) he loved you?! [=whatever made you think that he loved you?]究竟是什么让你认为他爱你？

I'm sorry if I gave you the wrong impression. [=I'm sorry if I misled you; I'm sorry if you got the wrong impression from me]如果我误导了你，请原谅。

I don't know what gave her the notion that she could treat people that way.我不知道是什么让她觉得她可以那样对待别人。