It may go without saying, but any successful friendship requires interaction. We all have our “passive” friendships—people we know, but with whom we hardly ever interact. Do these relationships satisfy you? Not likely.
Sociologists, since the 1950s, have considered repeated, unplanned interactions to be one of the requirements for friendship formation. In this instance, unplanned simply means that you routinely visit the same places and run into one another. This is merely the beginning of a successful friendship, though.
Keep interacting. Go beyond mere happenstance. Plan outings based on mutual interests, or, even better, to learn about something your friend loves. Don’t let too much time pass by between interactions without explanation, either—this can sometimes lead to feelings of abandonment. Show your friend that you’re willing to make time for them.
We all love to feel important, and when a friend reaches out to us, wanting to spend time on us, it’s touching. Do this for your friends, and they’ll return the favor.