Girlfriends going to parties without you - advice?

[marsvolta619]

So, I'm in the "not cool with it" crowd. My girlfriend is currently at a party, to which she made no gesture of invitation towards me, and she didn't ask if it was ok or not for her to go to it. She just gave me the old "i think i'm going to a party tonight" line. I asked her how much she's drank when she called me and she said only one drink, which girl math = about 3 drinks.

Anyways, my question is, what's your play in situations like these, and is anyone really ok with this phenomena? We're in a close and committed relationship btw