"He's the one I've been waiting for all my life"....?(Any sign?)

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I always ask these line and still asking now... "How will I know that this is the one I am waiting for?", "How will I know that he's the one, I wanna spend the rest of my life with"? or perhaps I am just a romantic fool?.. Seriously? Is it true that there is a sign if this person is really the right and destined for you? ( Im worried I might spend my life waiting for a sign that might not come)..