A) Cheaters lie. My ex lied about his affair while I was right in front of him with the evidence open on his laptop! LOL. It's like they think they can just wish any consequences away. Do nOT let him gaslight you any further with his excuses.
B) Does Bubbles do anything financial in the office, like billing? Or reception? Just know that doctor and dentist offices are notorious targets for embezzlers and it's usually the most trusted employee, the one who never takes time off. He should have his books checked to make sure she's not embezzling money from the practice.
As for Bubbles' husband - me personally, I would want to know. But it shouldn't come from you - or if it does, should be anonymous.