I need your help - he changed his identity

Hey girls, so my bestfriend is dating this guy for over 4 years. Recently, they had problems and so on. She found out that he has a girl friend for 3 weeks and he hard to her lies. He told her fake name, fake proffesion, fake things about him, complete new fake identity. He stopped paying his bills, so he could take her out and so on. What do you think? I told her that she should send him to see a psychologist, because there is serious problem.