I've done so much for you is the shit a narcissist says to you when, really, they’ve done little or nothing for you. Possibly, even fucked things up for you.
I've done so much for you Mommy Dearest says as she tells me about all the places she has brought me, all the while, she is beating the living shit out of me.
The thing you say when your best female (or male if you’re female) friend is singing the chorus of “Lovefool” by the Cardigans and dancing with a stick that has a wig that looks like her/his crush’s hair on it, and you’re scared and jealous of this man/woman.
When someone is obviously irritated or annoyed you can tell them ‘don’t sound so excited!’ Or maybe ‘don’t seem (or get/be) too (or so) excited!’ To piss them off or maybe make them laugh.