Forget doesn’t mean you are stupid. It doesn’t mean that if any symptoms come up of their previous behavior that wasn’t correct, you are not at that point not defending against it. It doesn’t mean you are just open and trust and therefore you get run over.
Reading from Nectar of Instruction Study Guide: The devotee's duty is to practice forgiveness and show mercy. HH BVPS Maharaja: Because forgiveness, it's one of the, you could say, the shastras will talk that it's one of the prominent qualities of the brahmana, if not the most important, is forgiveness.