Is grinding at a house party cheating?

So, my girlfriend and I are at this house party, she's out in the yard chilling while I'm inside where the music is playing. The girl whose house it is pulls me off the wall for a dance, and I'm cool with that. My girlfriend and I dance with our friends all the time when we're out partying. The hostess starts grinding back on me, and before you know it, she's got her hands on the back of a chair, sticking her butt out.

This chick has a badonkadonk on her, so any normal guy is going to get hard under those circumstances, especially since she's gyrating and clenching and unclenching on my boner, sliding up and down on it, that sort of thing, really going to town. This little-bit-naughty horseplay goes on for no more than five minutes or so, then we laugh and go back to drinking, end of story.

Now, some nosy clown must have told my girlfriend, because on the drive home, she starts yelling about how I "totally disrespected her" at the party. Okay, now number one, like I said, we always dance with other people at parties. Number two, how could I be disrespecting her when she wasn't even in the room and didn't see a thing? Number three, we'd all been drinking, including her.

She is all mad at me , accusing me of "butt-fucking that ho" as soon as her back was turned and being an asshole cheater. Seriously? I may have slept through part of health class, but the way I remember it, F-ing has something to do with a penis going into a vagina! To me, she's making a mountain out a molehill. I don't even find that other girl attractive. Who is right?

Is grinding at a house party cheating?
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