Is it normal i still miss my dead cat after almost 10 years

I grew up with this cat, he was my best friend in preschool and I loved him and cared about him more than anyone else, even though I made new best friends in elementary school, I still loved him with all my heart. Until 2009. On my sister's birthday, we went out to eat. When we came back, I went to look for my cat Boris, he was laying in his cat bed, and he was barely breathing. I told my mother, but she was on the phone. (I was still a child and was unaware how severe it was) When she got off my father stayed home with me and my other siblings, while my mom rushed to the vet. That was the last time I ever saw him. I never got chance to say goodbye. I'm now living with two american shorthair kittens, and I have lost other cats before, but nothing has left me as sad as this. My other cat had died over the summer last year, and I can't even bear to hear her name mentioned. Since it's only been 4 months since she passed, I figured that was more normal. Just for more information, I love my animals like most people love family members. Mainly because my family is a dysfunctional mess. But does this almost 10-year sadness normal?