Hi HaWho, that is a sad story about your H's mother. I hate to think of him being unwell and not being cared for properly. I can certainly understand how he must fear dying alone and no-one realising.
That said, I agree with posters above. I don't think you need to take action on this, other than listening as you have. After all, if he chooses to leave his door locked or unlocked is up to him, but it is good that he trusted you enough to share this. I would say not to raise this again unless he chooses to discuss it with you.
Hope you have a good weekend and that workload settled down for your S. Xx
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus