Before you get married, everyone tells you that marriage takes work. I never really believed it until my husband and I landed in therapy after four years, two kids and one seismically stressful cross-country move. Turns out you really can't just flip the switch to autopilot and trust love to take care of itself; you have to devote actual time and effort to understanding and appreciating your spouse. Anyone who is married knows that's not always a simple feat. Here's what relationship research (and a touch of game theory) tells us about how to become a better spouse.