Betta Fish: My old guy passed away today and I can’t help but blame myself

Hi everyone. This is Percy. He's been with me for 3 years. Recently my mental health has been in decline and I haven't taken as good of care for him. He passed away today. I can't help but believe it's all my fault. I'm not looking for attention or anything but rather a place to put my thoughts. I hope he knew I loved him and I'm sorry. 🥺