In twenty eight Weeks Later what did Don do when the infected raided his home and came after his wife and kids?

In "28 Weeks Later," when the infected raid Don's home, he initially panics and is overwhelmed by the chaos. In a desperate attempt to save himself, he abandons his wife, who is trying to fend off the infected, and flees the house, leaving her and their children behind. This act of survival leads to significant consequences for him and the other characters throughout the film.