What to expect in a relationship

A new listener's reading for this podcast episode: 'What to expect in this relationship?' And Yi's answer - changing to Hexagram 41, Decreasing, changing to 26, Great Tending (or Taming or Nurturing...), with changing line 3: 'Three people walking,Hence decreased by one person.One person walking,Hence gains a friend.' Hexagram 41, line 3 Who are the people walking, and what could this be about? (If you'd like some more listening/reading, here's an earlier episode that also started with Hexagram 41, and here's a post about how mountain works as outer trigram.)