So what, you can't be annoyed at your girlfriend for grinding up on someone else? That's idiotic.
Dancing doesn't exactly mean grinding.
I've seen this kind of horrible attitude turn to domestic violence so often it's not even funny.
Yep, attitudes like that spiral so quickly it's dizzying.
"Dancing with other dudes is not ok"
"Texting other dudes is not ok"
"Talking to that whore friend of yours is not ok"
And so on and so forth. And don't forget needing to punish them when they do something not ok!