Thanks to everyone who supported me in the previous magazine. I would like to answer everyone, but after trying to answer one person, I realized that I was starting to cry again. (sorry)
Now I am more or less stable and therefore I can make an extended post.
Because it will probably be right?
So many people supported me all this time, and to my regret I did not always respond (due to language and the fact that I was overwhelmed) I really am very grateful to you all for your support! This was important to me.

I'm glad I had the time. As long as I went to veterinary clinics and spent time with Tosha, I was able to go through all the phases of accepting the inevitable. I managed to meet many people on the Internet and in reality who went through feline viral leukemia in their pets and lost their pets or continue to fight this disease.
It is no one's fault that my boy got this disease from his mother. And I can’t blame the elderly woman from whom I took him into my house; I don’t think she even knew that cats have such diseases.
The last week was just... like a bad dream, we fed him what he likes and monitored his behavior.
The farewell was calm, he just fell asleep and didn’t wake up, there were no seizures or anything like that (I saw this during the euthanasia of a rabbit), I was with him until the very end.
Tosha will forever remain in my heart, his stupid playful bites, the scar on my hand, the demanding meow when I crumple receipts from the store (God cat, why is this your favorite toy?) The way he sleeps on the roof of the shipshilla cage in a basket. And how he builds pyramids from filler in a pot. How he sleeps on my tablet, not allowing me to draw, and lies on the window asking to scratch his striped belly. And how Tosha for some reason dug into flower pots in order to dig up bulbs.
take care and thanks again.