There is a well-worn saying, often mistakenly attributed to Albert Einstein, suggesting “women marry men hoping they will change. Men marry women hoping they will not.”1 This statement may or may not be true, but highlights an interesting (and understudied) relationship dynamic: Change plays an important role in relationships. It is natural to wonder how long your relationship will last, whether you will fall out of love, whether you’ll have children and what they’ll be like, how your partner will be as a parent, whether you’ll get a divorce, etc. The common denominator in each of these inquiries is that you and your partner will experience your fair share of change along the way. But is this change good?