he should be fine. I wouldn't rake your boyfriend over the coals too much. humidity does need to be higher than normal during the shed cycle, but a few hours at the 50% mark isn't going to ruin otherwise good husbandry practices.
i'm also assuming you're using a glass tank with a screen top? it's usually what everyone starts out with, but humidity is always an issue. you might look into getting a small rack system, or if you want the aesthetic, a display cage made of pvc or some other quality material that will hold the water vapour in the air. they're certainly more expensive but worth the investment in the long run.
hope all goes well.