I like this too. And it's a big fear of mine... that anyone I partner with will eventually leave because marriage is not easy and I am not perfect and Bexcuse people get bored of the mundane.
But zues, no one would describe my parents as enlightened, spiritual types. They annoy each other,and disagree with each other. But they also travel together, spend time together, accept each other for their eccentricities (to put it nicely) discuss politics, watch TV together etc. Etc. Etc. They truly do respect and love eqch other. They have been married for over 40 years. No affairs or breakups. I really don't know how one will survive when one of them dies.
I am going to reread you post though amd respond more. I just wanted to quickly let you know this. That it can be done.
