So essentially, in class, our teacher gives us some questions to work on from the book and lets us work with whoever's nearby. I set next to... let's call her Bob, and whenever this happens, we have a simple enough arrangement. She grabs the book (I'm lazy and the textbooks are all the way at the front of the class) and then I search for the answers and give them to her.

She gets work on drawing, which I don't mind, she's an amazing artist and I love seeing what she has to draw. All she has to worry about is writing what I tell her. Instant A+

Today, Bob refused to grab the textbook because she doesn't feel well. I'll admit, she's been acting weird all day. I was worried for her at first, but for some reason, this just pissed me off. I end up grabbing the book myself and refuse to give her the answers. I figure, If she wants to pass, she can do her own work. 

She doesn't. She just naps all class and gets an F for the day. I do the work as usual, just on my own for once. 

I thought it was a fair enough arrangement, but Bob seemed pissed, replying to my texts with one-word answers and basically ignoring me irl. 

I thought it was a clear cut case, she's was lazy and got what she deserved, but her reaction has me a little worried. Am i actually the asshole? Shit. 

Tl;Dr: Bob refuses to grab the textbook so we can do the work. I refuse to give her the answers, and now she's mad at me.