needs some advice a bit of a downer below

We had to put down our 14yo cat last night he had some neurological shut down but he was my partners for like 9 years and she’s devastated, I’m torn too but it’s not the same I’ve only know him for a year. I haven’t lost a pet in a long time does anybody have any advice? We had 4 cats now we have 3. I’m just trying...