Friendship is always an interesting chemistry between two people and true friendship always stays intact. Friendship is dependent on the understanding between the two. The more perfect the understanding is, the stronger is the friendship.
Nonfulfilment of the expectations is the main cause of worry. So, if you do not have any expectations you will never think of its fulfillment or otherwise. But the problem is, we all have some expectations from the other. There are many instances, even people say in most of the cases, people continue a relationship for the fulfillment of certain expectations. When there is no chance of them being fulfilled, the problem begins. In our life, we find only a few relations where there are no expectations. We may find only a few very close friends who remain there as friends and come forward when we need them most.
There are compulsions in all our lives and we need to understand that the other person also has compulsions. It may not be possible to be in touch on a regular basis, but when a perfect understanding is there the relationship remains intact. I would like to end with a sentence that I have heard long ago. It is, the best friends are those who have the perfect understanding of their differences.
"Life is easier when you enjoy what you do"