If he really was a believer, the Holy Spirit will convict him. It may take longer that we would like, but God’s time is not our time. But convict He will! Just like the prodigal son, he never stopped being a son, but he had to eventually get up and return to his father’s house. Having gone through a similar experience with one of my children, I understand the father waiting (you cannot force your child to do the right thing) and the father’s continual love and looking forward to reuniting with his wayward child!
He is a believer, and I assume he was convicted of his sin. However he also believes in the doctrine of eternal security so he really understands he does not have to worry about any eternal consequences of his mortal sins, other than loss of heavenly rewards according to the doctrine and I think espoused by some here. Now if he were a penitent Catholic the fear of God’s righteous judgment would compel him to seek a priest, confess his sin, submit himself for appropriate penance to make it as right as could be made after the lasting earthly damage to other hearts, minds, and souls. But he is not a Catholic, and he is a minister of the Gospel, with no earthly overseer. He knows he is a believer so he just does what he deems best. People fall in, out, and into love. Its like the flu, once its onset is felt there is vomit left for others to clean up, unless it is dealt with wisely.
Oh man, can I relate to that...