Personally, I/we have cameras throughout the common areas of me and my S.O.’s home. We have people come take care of our dogs here and there, people drop off and kindly steal packages, and we are also in an “improving” neighborhood where we get to hear the occasional “firework” (gunshot). But I live in the US and “celebratory fireworks” are sadly very normal in some areas.

If he’s not sharing access to those cameras with you equally (I.e. Ring shared access), that’s very questionable. On the other end, if he’s sharing access with you and you’re questioning it (it doesn’t sound like this is the case), then that’s also questionable. So, get access if you don’t have it already. If he balks at that idea, I’d get very curious. And throw a handful of red flags into the air.