My cat passed yesterday of cancer - 15

We had to put down my big old boy Paris (Bobby) down yesterday at 1pm as he had cancer in his bladder which spread to his stomach and he could no longer function, he was peeing blood everywhere, and couldn’t eat, despite knowing him being put down was freeing him of his pain I can’t help but feel guilty for getting him passed and I am really struggling with his absence, he was euthanised at home though which was calmer for him. I love him and miss him dearly.