M：I‘ve been thinking about change over time. I realized that the problem isn’t really change. It‘s whether two people change in the same direction. We want to keep our coordinates close to each other for the rest of our lives. F：But people sometimes do drift apart. M：yes,You need a warning when you and your partner might be starting to veer off,so you can both change course a little. You don’t want a surprise realization when it‘s too late. Surprises are awful. Change