: They defined what "cheating" meant to them, including physical acts and digital boundaries.

Instead of saying, "You can't talk to your ex," try: "I feel insecure when you text your ex. For me to feel safe in our monogamy, I need that boundary to be defined."

They sat down one Sunday morning with a blank piece of paper—their . Instead of a list of "don'ts," they framed it as a set of promises to protect their shared space. The Foundation: The "Big Three"

: They committed to being a team in everything from paying the mortgage to deciding who does the dishes.