Yes, it can. Although many people view a true friendship as a two-way street that is based on equanimity and mutual respect, it is not always this clear cut. Some people will enjoy fulfilling, and long-lasting friendships with people they know do not give as much back. Equally, some people will enjoy having a more casual relationship with one or more of their friends even though they know the other party would like more out of it. In most cases, this can work out so long as both friends know exactly where they stand and what they can reasonably expect of the other person. However, it can lead to trouble, too, especially when one friend is always seeming to do all of the 'work' needed to keep the relationship going. In such cases, it is not uncommon for friends to slowly drift apart from one another.