Furlong was in a relationship with a 29-year old woman who was his on-set tutor during filming of Terminator 2: Judgement Day. He was 15.
She eventually became his manager, although she did little to steer his career in any meaningful way. Furlong starred in a number of critical and commercial failures, none that came close to replicating the success of Terminator 2: Judgement Day.
Furlong would eventually get engaged to - and split from - his manager, both personally and professionally. In 1999, she sued him for money owed to her for acting as his manager. She also claimed he was physically abusive.
Throughout this time, Furlong is said to have taken hard drugs - heroin, cocaine - and was in the depths of serious alcoholism.