That's not really important to me还是for me呢?

e important to sb。:……对sb。而言是很重要的,强调对某人很重要的东西。。eg。What is important to you is also important to me。对你重要的事对我也重要。Money is important to me。be important for sb。（to do sth。）：某人……是很重要的,强调做某事对某人的重要性。eg。It is important for you to get there early。