to rituals. Think about the people you do keep up with, and you’ll probably find a ritual, conscious or not, underneath it. “We talk every Sunday,” or “we exercise together.” Replicate that. It works. Find something to do together consistently. Research from Notre Dame that analyzed over eight million phone calls showed touching base in some form every two weeks is a good target to shoot for. Hit that minimum frequency, and friendships are more likely to persist.

