My friends boyfreind has done something very unthinkable?

yesterday my freind wen on her computer and found emails from her b.f .he was on a website looking for men. They were gay men he was talking to abd sent them his number to call him. When she comfronted him about it he said that he wanted to gett them there and rob them. i dont know what to make of this and i am very worried either way i just dont know how to help my freind