flyerwife -
It seems that your actions include intentional deception - making a reservation in your spouse's name when you will be the only occupant and saying he will be there later when you know he won't - presumably to get benefits you wouldn’t be entitled to if you always stayed under your own name and MR number.
It puzzles me as to why you see nothing wrong with that.
Also, it makes sense that you would not have received anything from Marriott regarding adding your name to your spouse's account. Marriott doesn't allow for joint accounts and your actions seem to acknowledge that.