Husband wants to go see his prison dad

My husband went to prison for 13 months when he was 18 for identity/credit card theft. He's almost 30 now. He made a lot of mistakes at a young age. His mom was abusive. His dad was absent. How he met this man was in prison. He was very young in prison and we all know the prison system is fucked. This man that became my husband's father figure in prison was arrested for trafficking drugs for the cartel. My husband got sexually assaulted in prison and this man stopped it from getting worse because he was clearly going to be gang raped. He still was raped in prison. It was just by one person for 15 seconds instead 7 other people for way longer. He stopped it and kept it from happening again by letting my husband tag around with him. When my husband got out they still wrote to each other. Now he got out. My husband would like to see him and wants me to meet his "prison dad". I don't think I want my husband attaching himself to someone from a very bad time in his life but I know this would mean the world to him. Any advice would be appreciated