Well, of course I hate to be the one to suggest it, but are you sure this person really likes you? It could very much be the suggestion of the dream. You know how powerful that sort of thing can get to be.
But, if this is not the case -- I suppose it's safe to proceed with caution if it suits you?
Scott
PS: Of course, considering your best friend status, please make it known that anyone that wants to date you has to talk to me first.