Am I a useful idiot?

I have this female co-worker and she constantly asks me to help her at work even if im busy with my own or its something heavier.

We chit chat and all that, so i asked to get drinks a few times. And she agreed to it and seemed to be quite happy to just get drunk.

Texted her a few hours ago and she tells me she's already out with 2 other co-workers (a man and a woman)

here's the part that pisses me off. She asks for my help waaaaay more than his, she constantly tells me how greatful she is that im going out of my way to help out, but doesn't even invite me for a beer or 2.

So here's what i want to know.
1. Am i a fucking idiot?
2. How much of a cunt should i be on Monday
Am I a useful idiot?
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