What right to privacy if you are married?
What is it that you don't want your spouse to know and why?
You get naked with each other (is there anything more private than one's privates?), you share the bed with each other, you know every square inch of each other's glorious naked bodies, you share precious bodily fluids with each other, you share emotions with each other, you share each other's innermost feelings and et cetera, et cetera.
.....and yet you (not you personally) still want to hold some things from your spouse?
Unless you have something to hide I don't see any other reason why you would go to such lengths as to hide mundane issues such as 'last seen' statuses on Whatsap, etc.