I understand your pain at his passing. We had to put our cat 'Jake' down about a month ago. He was pushing 17 years. He new it was coming, but in a way it was what he wanted. He was hurting, (he had seizures and I think the last one he had he kind of beat himself up), he gave up trying. When he quit eating we knew it was time. Still miss him, and always will. It will get easier with time.