Discretion is the better part of valor, friend -- and good timing is mighty important too. Learn to choose the proper moments for action, thereby avoiding futile effort. Be attentive also for changes that signal a time to retreat.
In the realm of personal relations, discovering illusion is always painful, and confusing. When in the midst of such a period, it is wise to avoid undertaking any bold new moves, and it is especially important not to jump to conclusions too quickly.