If you don't want to know if people are adding you as a Buddy as you don't want to be Friends with them, just choose the "No" option in User CP, Options, Messaging.
People can still add you but you won't know about it as you won't get a PM.
Starting today August 7th, 2024, in order to post in the Married Couples, Courting Couples, or Singles forums, you will not be allowed to post if you have your Marital status designated as private. Announcements will be made in the respective forums as well but please note that if yours is currently listed as Private, you will need to submit a ticket in the Support Area to have yours changed.