I admit that saying "whatever" is a bit rude for us, but in some culture it's normal for them. I never liked it when my ex used to say "whatever" when we are talking about something serious, and I will lose my temper coz of that. But after talking to her about it, she understand, and she used the word lesser. Improvement? Yes.

But have you ever think that, doing this to her and make her change will leave a root in her heart.. she will think that, wtf are you trying to change her into someone else? The problem will come sooner or later.

If you can't accept the attitude, then you guys are not meant to be together. Sorry to say that, but it's the fact. Loving someone is to accept him/her exactly like how he/she is. Not changing him/her into someone that you want it to be.

In this case, you can't accept, then leave her.