Although he has prayed and believes that God has forgiven him, he should seek the help of an elder so that such a sin does not become habitual. An elder or two might handle the situation.
عِنْدَئِذٍ ،‏ سَيُسَاعِدُكَ ٱلتَّأْدِيبُ ٱلْإِلهِيُّ أَنْ تَبْنِيَ حِصْنًا رُوحِيًّا —‏ دِفَاعًا أَشْبَهَ بِسُورٍ مَنِيعٍ ضِدَّ ٱلْخَطِيَّةِ .‏