I think having reliable friends is important because of at least two reasons. Firstly, having reliable friends means friendships that are based on openness so I can count on my friends no matter what. They will not hide any information that will make their partners feel left behind.
They will always try to support their friends in many ways because they know that there won’t be any useful to hide anything unless it’s really confidential. In this matter, I can trust these kinds of friends and I believe that they will not let me down no matter what.