"Charity suffereth long, and is kind; charity envieth not; charity vaunteth not itself, is not puffed up, doth not behave itself unseemly, seeketh not her own, is not easily provoked, thinketh no evil; rejoiceth not in iniquity"
Love will never be happy at another persons downfall. It will not have pleasure but will grieve with the person. Love will rebuke a sinner, not in pride but in humility, to help keep the brother from further sin.
It made me think of Nathan telling David of his sin with Bathsheba. He did not gloat in his own righteousness or taunt the King with what he had done, he simply presented the truth to bring the king to repentance. He wanted the LORD to be pleased with David, Nathan was not trying to exalt himself, but help the king. He also did not just leave him in the sin for fear of rebuking the great king, but boldly told him of the evil to keep David from further sin and worse consequences than he had.
We should grieve with those who have sinned and work to help them be restored in righteousness before the LORD. This is real love and affection!