Does this dream mean he's the one (description of the whole dream)?

Need to tell the actual dream. This is way too specific and you mentioning time is a clear indicator this isn't actually a dream. Your subconscious doesn't mark time; it has no reason to. Dreams are processes that fire so fast that often it's hard to put them even in chronological order. Dreams are also usually about outer experience processes; what you were wearing would have very little detail. If you had just said a white dress and jewels, that would be slightly more believable; but the specific items you mentioned can't be that vivid without starting a line of thinking that would change the entire dream. That would be going from Alpha to barely touching Theta and back to Alpha for no reason, I just don't see that happening.