Can you have a "heart to heart" talk with him? Can you express these concerns with him? Wouldn't it be a good idea to have a really GOOD talk with him and just be open and honest?
I think I would tell him just what you said here --- That you two haven't even KNOWN each other long enough to be able to say "I love you" or "I can't live without you." Tell him you think that you two need more time to get to know each other, but that you think the relationship has a very good chance!
Perhaps if you get the lines of communication open - and open them with HONESTY -- they'll stay that way.

Every relationship has to have good communication and the basis of that has to be honesty. So if you start it out that way, it sure will help!
Best of luck sweetie, and keep us posted as to how you do, okay? Hugs, Lee