Better is open rebuke than hidden love.
Confrontation of wrong is an absolute necessity in a true Biblical friendship. That is hard to do many times. Most people don't enjoy confronting their friends, but rebuking your friend does so much more than a hidden love could ever do. In fact, you might say that an open rebuke, if done in the right spirit, is the fulfillment of love, whereas if love remains hidden, it goes unfulfilled.