I don't love him. How do I tell him?

I am currently in a friends-with-benefits relationship with a friend called Doug and he's psychic but won't tell me my future but does tell me that I'm meant to stay alive for a reason and that he is an angel. As special as he is, I'm not attracted to him. He loves me very much and is protective of me and has been hurt before by skanky girls and is in an abusive situation. I want to be there for him but also at the same time, something tells me he isn't my soulmate but he thinks so. I actually have my heart set on a guy who is currently in a relationship with a girl that looks like me but she is completely not his type. Their only direct similarity is that they both like anime and speak Japanese (he was her tutor before they dated). And he also looks like Doug which is weird. The taken guy has been giving me signs or has been showing foreshadowing that he likes me before and after they started dating. Me and him are so much alike (also wearing identical pieces of clothing) and I sent him an anonymous candygram saying "Hello". His girlfriend's best friend is jealous of me and might hate me and I'm afraid those three will turn into my enemies :( What should I do? Me and the taken guy have the same rutt. What now? Where do I go from here?