Rare as is true love, true friendship is rarer.

Love has a strong pull behind it, and that pull does much of the work of keeping two people together. Friendship has no such engine. It has to be chosen again and again with nothing pushing, which is why so many of them thin out without anyone deciding to end them.

Think of the friend you would be glad to see and have not contacted in months. Send a message with no occasion attached. Then put one standing hour in the calendar for someone whose company you value, because the ones that last are the ones that got scheduled.