cheating or lying

How can you tell if someone has two separate Apple ids? Would a secondary Apple ID be something that could aid someone who is cheating, kind of acting as a “burner” secondary phone? Could they be logged into one on a secondary device like an iPad while the other id is logged into their phone?

I recently checked my boyfriends Significant Locations and it only showed history from Aug 1st to now (Aug 6th). He claims he didn’t manually clear this history. His excuse is that he signed out of Apple ID July 31st which must have reset/wiped his significant locations history ? is this...

My husband had his old iPhone (8?) in his drawer, it had been wiped clean. A week later I looked at it, and it had contacts on it . It had both very recent contacts, probably within the last month, but it also had what (he says) were the old contacts that were on that phone before we were a...