I learned a valuable lesson today: Never take anybody for granted. Regardless of your relationship with the person, unforeseen circumstances can alter the relationship in ways that are not pleasant for you. Health, employment changes, or even personal goals can create situations that can end the relationship. This is especially true in professional situations. While the ending of the relationship is not good for you, the other person may be leaving for exciting opportunities is growth potential, which you must accept and congratulate the person. Cherish the moments and do not plan your life around any relationship being permanent.