Just that really. A married man, telling his wife he has to spend 2 nights a week in main land Europe for the foreseeable future, while a troublesome job is completed.
After the first trip she realised he hadn't asked her to find his passport, and whilst he's an intelligent man she would usually do such things for him. 2nd time, she checked the drawer while he was away and the passport was still there. Trying to be positive for her, but I can't think of a decent explanation.
She doesn't want to confront him because she "trusts him", but also, I suspect because she doesn't really want to know.