My gay son's boyfriend is ruining his life?

My gay son is 19. He has a boyfriend. It's ruining his life. I told his boyfriend that he needs to stop dating my son and that my son wants to be normal, but he doesn't listen. I don't want my son to end up in hell. I don't want him to die of AIDs or STDs at 30 like most gay men do. How can I make sure they break up and my son gets back on a straight level?