why having reliable friends is good

"Those who do not have a reliable friend to share their sorrows with, make loneliness their friend. Sitting alone, talking to air and ground, gives them a sigh of relief. Because if grief takes place in a heart, suffocation increases. If the tongue cannot express it and there's no other way to lighten this burden, then these sorrows will kill a person." Tawq al-Hamamah by Ibn Hazm (p.49)