I'm not going to attend my girlfriend's recital.
Why not?
She's an asshole to me and I don't care about her.
One should be supportive of of their partner, but if you strongly dislike her that's a different thing. You don't have to attend the recital, but you should also end the relationship as it's clearly not working for either of you.
I'm going to watch American Idol instead.
You might regret not going. If you don't like her it might be better to break up now so you both can find people better suited for a relationship.