After a romantic relationship ends, one of both partners may resist completely letting go of their connection to the other, leading them to try to maintain a friendship, online communication, or even having sex. Experts suggest the key to a healthy parting is the establishment of strong, agreed-upon boundaries, based on an honest assessment of how much contact partners decide they’re comfortable with, and clear communication about it. But at least at first, research suggests, the healthiest boundary may be to take some time apart to evaluate next steps without pressure.