Liking someone knowing you wouldn't work out

I thought about how to type this up for perhaps half an hour. I decided on keeping it simple because the title says it all. Should I bring "us" up and tell him what would and wouldn't work, and how things could be improved if we were to go out? Or do I tell him we wouldn't be compatible? I like him, and I would like things to work out, but I don't want him to change all because of who I am, and what I want. We have this very odd connection, but I'm not sure if I would see myself with him. He also has more feelings of lust, rather than love. I guess I could say I feel that lust just as he does, but there's some feeling to it, too. It's all quite complicated, but I need some advice on what to do or I'll go crazy lol

If details are needed in order to help with your response, please let me know. Thanks so much.

Yeah...some details would be helpful lol