Jonah Hill texts spark conversation on boundaries

Leaked texts between actor Jonah Hill and his ex -girlfriend have sparked a conversation about boundaries - versus rules. Some say the actor is really stretching the meaning of the term demanding his ex, who is a professional surfer, not surf with men, model, or have friendships with women who are in an unstable place. So what actually is a boundary in a relationship and how can you set them in a healthy way?