I'm going to leave my girlfriend at a party
Why would you leave your girlfriend at the party?
There are other women who are more interesting to hang out with in the party.
Leaving your partner for other women is rude. If you don't find your girlfriend interesting then you should break up with her before the party.
You sound like my father.
Why are you even with someone who you don't find interesting enough to hang out ? It'll hurt your gf and probably she'll leave you for your attitude. You better talk to her and make sure you both are on the same page.