Boy A (2007) on Netflix

Sensitive, well-meaning Eric Wilson served a long juvenile term for violence committed by his former classmate Philip Craig, who committed suicide. He does everything when parole officer Terry arranges an anonymous new start for him as Jack Burridge in a delivery firm. He becomes buddy with colleague Kelly, who introduces him to party life, and becomes 'easy' firm clerk Michelle's lover. Terry considers him his greatest achievement, unlike his neglected, 'lazy' son Zeb, whose growing frustration will prove tragically crucial.