What is so uncommon as a bit of common sense? That's what you've laid down here, more of it in one place than I've seen in a while. And on a topic that we all keep trying to pretend is rocket science.
I think you started in exactly the right place. The quality of all your relationships will depend on the quality of your relationship with yourself. When you value and enjoy your own company, you won't readily trade it away for the company of someone you don't really like.