All I remember is that this man kindnaps the boy and makes him his son and makes this women his wife and the women tries to help the boy by getting away in one scene and the guy find them trying to get away and he catches them... and he doesn't trust the boy so when he goes into the store he headcuffs the boy the seatbelt... when the gut get into the store he sees the milk cartoon and it has the boy face on it so he kills people that was in the store and runs off... at the end I know the boy and women leave after she kills then man but she leaves the boy on the side of the road and she takes off by herself... thats all I rermember...

That makes me think of A Perfect World with Kevin Kostner whose character is killed at the end of the movie

But there was no woman A Perfect World (1993) - IMDb