I have found that if you don’t have expectations of others, you won’t be disappointed.  

When in a friendship with a friend, it is easy to expect them, especially when you have been with them for a reasonable amount of time, to know your feelings and some of the things that are important to you.  Such expectations without you verbally stating your wishes can often lead to great disappointment.  I have found that when you are in a relationship and don’t have many expectations of that person, you are less likely to be hurt when your expectations are not met.