Friendship is defined as a relationship of mutual affection between people. It is a stronger form of interpersonal bond than an association and has been studied in academic fields such as Communication, Sociology, Social, Psychology, Anthropology, and Philosophy." Source
Going by the above defination of friendship, there's no doubt that it's the strong force behind our togetherness, and therefore needs to be guarded jealously less you loose your friends.
Below are 4 ingredients that make frienship stand the test of time.
Trust: When you have people hanging out with you and openly sharing their life with you is probably because they trust you and are confident that you will lift up to their expectations. We can compare this kind of trust to terms and conditions of an organisation that should never be broken, and if broken, there's so much to loose. So is friendship. You can loose your friends forever if you break their trust.
Trust is an essential ingredient in all successful relationships. When a friend breaks your trust, rebuilding that trust isn't always easy because feelings of loss and betrayal can linger." Source
Reciprocation: One of the act that keeps must frienships growing stronger is reciprocating. When you also give back to your friends as they do to you, you keep them bound to you.
Reciprocating is similar to a game of tennis or Pin Pong. There's a rhythm or a flow of a back and forth exchange. When someone reciprocate our efforts, it can leave us feeling validated in our choices and friendship or relationship and give more, and leaves us with this overall sense that we are valued and appreciated." Source
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Keeping In Touch: Frequently keeping in touch with friends is another thing that makes a frienship stays alive. Although you don't have to see, talk and interact on a daily bases, but you should as often as possible call, chat, or even see each other.
Show Concern: Nothing keeps frienship intact and going like constantly getting interested in the things your friends do and are concerned about, and sharing your own interest with them. They expect you to be there for them in both good and bad times.