Is AUTHOR wrong in the post ? POST : My girlfriend's parents got divorced and her mom's got a new boyfriend. Her mom wants us (girlfriend &amp; me) to double-date with her and a few aunts/uncles tonight. 

Girlfriend feels uncomfortable about the whole thing and wants me to come with her so she feels less uncomfortable. 

I'm stressed with work and am also taking classes part-time. I don't have time to waste (even on a Saturday night) so I declined going. Honestly, I'd rather spend my time studying. 

She's mad at me for not going. AITA? 