(…) friendships are fragile. Unlike family bounds, they depend on you investing enough time and effort in each other to keep the relationship well oiled and functional. If you see someone less often, whether deliberately or by force of circunstance, that relationship will weaken. Bob Kraut at Carnegie Mellon University in Pennsylvania calculated that a friendship of high strength will decline to no more than a mere acquaintance in just three years.
Nota: Acredito-me no tempo, nunca no esforço. Se aparece, já a amizade desapareceu há muito. Até é corajoso, o esforço, por vezes até ousado, mas falha-se miseravelmente.