Is AUTHOR wrong in the post ? POST : My girlfriend and I are both college students.  She lives in an apartment on her own and I live with my parents.

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On Sunday, my girlfriend made homemade lasagna for our date night. She made everything from scratch, including the noodles. It was really good so after we finished I asked if I could take lasagna home for my family to try. She said yes.  When I left that night, I took the tray of lasagna with me. My girlfriend didn't walk me out so she didn't see me take the tray.

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On Monday, I got a text from my girlfriend asking where her lasagna was. I told her I had taken it home for my family.  She said "I thought you were going to take SOME... not the whole thing. I spent most of my food budget for the week on it with the intention to eat leftovers for the rest of the week. Now I don't know what I'm going to eat."  I felt bad and apologized but pointed out that I had asked her if I could take it home and she didn't tell me that I couldn't take the whole tray.  She said it should have been obvious that I shouldn't take the whole thing since the tray was so big.  To be fair to her, it was a really big tray (my family of 5 only just finished the tray yesterday after eating it for dinner both nights) but I don't think the size of the tray makes it obvious that I shouldn't take it.  

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Monday night and last night, my girlfriend complained that she had to eat instant noodles for dinner so that she wouldn't blow her food budget. Today, she is asking me if I can buy her a sandwich since I took her leftovers for the week. It sucks that she spent her food budget on the lasagna but I think this is her fault for not being clear that I shouldn't take the whole thing. I don't think she is justified in asking me to buy her lunch because of it. She called me an asshole for not being willing to help her out. AITA? 