You mention that his pupils are "kind of blue" now. That's not normal and sounds like he may be going blind or developing cataracts. He needs to go to the vet. Any drastic behavioral change should always be checked for medical causes.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry