Ok! So I have been struggling with feeling like the asshole here. I (27F) have been in a loving polyamorous relationship with my partner (30M) for a couple years. Recently I met a new person (30M), let's call him Wallace, and quickly became quite infatuated with him. We went on several fun dates and chatted daily about our interests, kinks, life goals, the whole shebang. I was feeling really comfortable and safe with Wallace and after some negotiating we agreed to a sleepover at his place and to have our first sexy times (woohoo!). 

However, that's where my excitement ended.. When I got to his place I found it to be dark, dirty, empty walls and gross furniture, mattress on the floor, etc. It looked like a college apartment. Then, he introduced me to his dog, a rescue dog who is extremely nervous. I'm not blaming the dog at all, but from the second I walked in the door she wouldn't stop barking at me, and she is a big dog, also acting like she was nipping at my hands. I couldn't even go to the bathroom without her barking continuously outside the door. I was getting uncomfortable at this point, but we retired to his room and I thought, "Ok! Rough start, but let's have a good fun sexy time!" I wanted to be in the moment and enjoy getting to explore this person's body for the first time, but that dog barked literally every second we were having sex. The whole time non-stop. We make dinner, to dog barking at me. We went on a walk, the dog barked at me, we came back and started to wind down to go to bed but the dog wouldn't sleep unless it was in the room with us and she kept coming up to me in the night and just staring at me and if I moved she'd start barking and growling. I felt paralyzed. I realized at about 4 am that I was having a panic attack because I felt trapped, I couldn't move or leave without the dog barking more and I was exhausted and stressed. I stayed just frozen in panic for hours. eventually Wallace moved, looked over and realizing I was awake asked if I was ok. I felt like the interaction unfroze me suddenly and I just stammered I had to leave, that I had a nice time with him but that I had to go immediately and I quickly got up and gathered my things and left. 

Since that incident, I just don't find Wallace attractive to me. It was like a lightswitch and I've never had that happen before. Am I the asshole for just flat out losing interest in him because of this? I feel like I built of so much hope and interest in our future and now that is all just gone on my end. I communicated with him that I was no longer interested, and he's really hurt and blindsided but honestly so am I? I really liked him and the feeling is just.... gone suddenly. 

TLDR; I was happy and excited about a new relationship with someone, but I lost interest after seeing how he lived and after his dog wouldn't stop barking at me.