This is not because he doesn’t trust her or even that he doesn’t trust himself.
He probably does this for the same reason Billy Graham wouldn’t even get on an elevator alone with a woman other than his wife.
It is to remove ANY occasion for tongues to wag in scandal, or to prevent even an APPEARANCE of impropriety.
It is a VERY sensible and appropriate policy, and protects his wife, his marriage, and himself from scandal.
Well said.