Harbouring the Idea of double dating from the onset is already a sign of disloyalty and unfaithfulness which already will lead to heartbreak and pains. I totally agree with you when you said "anybody who has truly found purpose, knows their self worth and has restraints (boundaries), is focused and has a sense of direction will be too busy to even consider double dating because he or she is focused and knows what they want, so they will go for what they want".
Yes, self discovery and personal development will keep you too busy from indulging in such. Thank you for stopping by.