Backstory: we’re both 20 year old college students and we live together in a tiny 650 square foot, one bedroom apartment

She’s been wanting to get some kind of pet for a long time now and I’ve been against it the entire time. I feel that if I don’t want a pet, she shouldn’t be able to get one because we live in a tiny shared space.

First she wanted a cat, but I’m deathly allergic. Then she wanted a dog but I finally convinced her that was a bad idea because we both work 30 hours a week while going to school full time and would have no time for it. Recently, she’s had her mind set on a guinea pig and I’ve refused yet again because I have to live in this place too and I don’t want one.

Fast forward a few weeks and I drive back to my hometown to spend the weekend with my family and watch the super bowl. Well, I come back Monday to find a GIANT, and I’m not exaggerating when I say giant, guinea pig cage on the floor on MY SIDE OF THE BED. She took the opportunity of me being gone to go buy a guinea pig, a full cage, and any other little necessity you’d need to own one, and set it up on my side of the room, completely taking up my space. I’m livid.

My only question is, AITA?

Edit: here’s a Picture

Edit 2: apparently the cage isn’t giant. I’ve never had a guinea pig before so I wasn’t aware. To be honest I was expecting something smaller when she said she wanted one