DEAR ABBY: I have been happily married for more than 40 years. Since he retired a couple of years ago, it has come to my attention that he has been getting mail at a separate private mailbox. I don’t see a good reason for this, and it is weighing on me heavily. I don’t want to make a big deal out of it, but I’m concerned. He sees all our bills and evidently pays other ones I’m not aware of. Becaus…