That’s a good start.
It seems pretty common for someone with a disorder to ignore all the signs and symptoms and irrational behavior. Truely, a lot of people with any disorder, but especially Sz / SzA suffer from a symptom that causes a lack of rational insight into their actions and the real world cause and effect. Sequence of events, logical conclusions and rational decision making can be honestly challenging (particularly in the midst of psychological distress from hallucinations or delusions).
He may internally question whether there is anything wrong with his reasoning and behavior, or even emphatically deny it.
If you are determined to be there for him and help him, being emotionally consistent, providing even-tempered reason and logic and having the patience to endure some very upsetting lack of impulse control and good decision making are probably going to be key. Hopefully not forever, but probably for a while.
Keep insisting that he deserves peace of mind and some genuine contentment. Keep respectfully disagreeing with irrational logic. Keep recommending habits that promote good quality of life. Point out habits that detract from it.
If things get violent or abusive, don’t tolerate it. Take action.
If you feel like you’re making too many sacrifices, be honest about it. With him as well as with yourself.