How can I help this pervert get his mind cleaned out and stay out of the gutter?

He keeps acting out every few months like clockwork almost. Masturbating (not having with me), talking dirty to girls online, looking at craigs list ads (perverted ones). etc. I am tired of being lonely and bored. He seems to be genuinely concerned about his issues but yet is having a hard time confronting them. We need help! He has really good health insurance too. What should I do next? Leave or try and help him?