I don't know about the "feel they are worth" part, and this is only from my personal experience. I have been happily married to the same man for 40 years. We are faithful to each other and live our lives as honorably and honestly as possible. When we talk about how we're still together after all these years, it always seems to come back to that we deserve each. We are equals in many ways, and not so equal in others, but he's never felt insecure in my love, and I have never in his. Rambling, I know, but feeling you deserve each other, in the most positive way, I think is what makes it work. Also there are many, many sociopathic, narcissistic people out there, and they probably deserve each other, but they're either too stupid, or too self-centered to see that truth. Yikes, that was way more than I meant to say.