My GF's (newly) single female friend wants her to go clubbing tomorrow night. My GF adamantly wants me to go. Her reasons include, her not being a "5th wheel", all the other girls bringing their boyfriends supposedly, and me being there preventing guys from hitting on her (I guess?).

I'm partied out and only like going to night life stuff every now and then, and want to catch up on sleep etc etc. I have better things to do right now than waste money on sleazy clubs and overpriced drinks, like build my new PC or ride my superbike.

Is there some good RP theory reason I should be going?