There is a chance he will leave suddenly in the next year, month, week, day, hour. There's a chance this is just a blip in the routine. It's kind of like gambling! Sometime, there is going to be a very very large cat-shaped hole in my heart, but right now he has gotten a medicinal snack and is looking forward to bedtime snuggles. Hug your pets!*
*I mean, unless they hate that. Consent, and all that.