Flurin, so sorry to hear that. There have been far too much death in my life this year, and sorry to hear of this infiltration into yours.
He loved you, the little guy, and he knows how you feel about him. I lost my good old tom cat Spot years and years ago. . . . I still miss him. I have my lovely tortoiseshell Marge still, over seventeen years old. . . . In time I bet you have another cat. They make such great companions.