The friendship that can cease has never been real. (Saint Jerome, 5th century Bible translator)

We occasionally refer to someone as a “fair weather friend,” meaning he or she will stick with you so long as everything is going well. It implies that when things become difficult, the “friend” disappears. Jerome says that such a friend was never a real friend. The biblical Judas Iscariot, disciple of Jesus, played just such a role. True friends stick with  you through thick and thin.

A friend is always loyal, and a brother is born to help in time of need. . . . [A] real friend sticks closer than a brother. (Proverbs 17:17; 18:24)