I say, and with God's help: You should be cautious of sin by turning away from him and not interacting or speaking with him. You should treat him well and show him affection, as this may be a reason for his reform and improvement of his character. Ignoring faults is a noble prophetic method in reforming souls. It is your duty to rethink entirely how to deal with him and to seek appropriate solutions. You must be patient in this matter and involve good people in it. And God knows best.