I'm wondering if it was the fact that your husband was away
for a week that Midnight did not pee on the bed. Perhaps it was hubby's rough handling he was upset about and it was his way of showing it? I think I would keep your bedroom door closed just in case or put on the plastic sheet. I wouldn't want to take the chance so soon that he might revert back to his peeing. I 'm glad to hear your "cautiously optimistic" and I'm hopefull too that this is just a phase he's going through, and in time will forget this behaviour.
Hang in there!