AITA for not letting my partner break down our spare room for her dog?

So i (25F) and my partner (29M) have been living together for almost a year now, and it's been great! His dog Jazzy is a very special dog, she has to be under constant care, as she's had a stroke in the past and is very unstable on her back legs, so she can't jump or anything like that. We have an extra room in the apartment, which my partner has insisted on turning into a room for Jazzy, which I didn't mind, as it's extra space and I can still have my own space to escape to.<br><br>However, something changed when my mother passed. I started to go through her belongings, and started to get my feet wet in something she used to love doing. Painting. I had forgotten how calming it was, and how fun it was. When she passed, I hadn't even done it since I was a kid. But now that I'm doing it, I really find it to be a great way to cope with her loss. I've painted the spare bedroom, and now I finally have some space to myself where I can do as I please and really feel at peace.<br><br>My partner, however, is not pleased with it. He thinks that it's a waste of space and that Jazzy could use it better than I do. He said that I can just paint by the kitchen or in the living room, and that I don't need a whole room for it, but I think that's unfair. I have something I do, and I want my space for painting. Can I watch tv in his gaming space? No. But he's always saying I can watch tv in my "painting space" but I want that to be MY space. I watch tv and do other activities like it in the living room, and we both have our own time to ourselves in our own spaces.<br><br>He's called me SOB and said that what I was doing was completely selfish and I asked him if it was selfish to have my own space like he does? He answered that it wasn't selfish because painting isn't like gaming, it's just a hobby. He's being really mean to me, and I think it's unfair to think that I should sacrifice my space and my things for Jazzy when his reason for it is that he doesn't want to take up floor space in the living room with Jazzy's bed.<br><br>Anyways, I've kept the room. He keeps telling me that I'm the asshole for it, but I think that he's just being super arrogant and selfish. He's also saying that I'm being weird for painting and that it's not a good way to spend my time. This makes me feel like shit, since painting makes me feel better and I think I'm doing a good job at it, but I'm not a professional or anything.