Kim and Glenn Schryver are experts at coupling in isolation. For more than a dozen years, the Schryvers have managed a remote mountain reservoir in the Rockies of Colorado. They go weeks without seeing anyone but each other. How do they do it? And what can they teach other couples who now find themselves in a similar position? … For Season 4, we’re looking for love lessons at all kinds of ages. Have a story you’d like to share? Email us at loveletters@boston.com.