“Like the Second Law of Thermodynamics, which says that in closed energy systems things tend to run down and get less orderly, the same seems to be true of closed relationships like marriages. My guess is that if you do nothing to make things get better in your marriage but do not do anything wrong, the marriage will still tend to get worse over time. To maintain a balanced emotional ecology you need to make an effort—think about your spouse during the day, think about how to make a good thing even better, and act.”

John M. Gottman

Why Marriages Succeed or Fail: And How You Can Make Yours Last