Suit yourself

[Becky]

Do whatever you want because I sure dont care. Frequently sarcastic although one may genuinely be [so over] the friendship that they really are [apathetic] about it.

Used especially when you want to be done with someone who is choosing to be a jerk instead of being decent. A good way to end a tense conversation when you want to show your anger [disapproval] of the other persons behavior.