Is it normal to grieve and cry weekly about loss from 3 years ago?

My dog grandma and best friend all died within 2 months from each other. I was so numb during all of it that I don’t think I processed it. I was just like there goes another one and I was so depressed. They all passed away in 2020 (not from Covid). Now, 3 years later I still think about them everyday day and cry about them multiple times a week.

Before they passed away, I was definitely low on serotonin and possibly needed an ssri back then. Soon after they passed away I also split up with my boyfriend. After that I was so depressed everyday that I started taking ssri medication.

I don’t know if I just have a serotonin problem, depression, or if I’m experiencing complicated grief, or if this is regular grief.

Has anyone had an experience similar to mine? How did you feel? What helped?