Don't know if its true

I was wondering if there is any clue, a sign, something that tells you this is the right person for you. And that if you don't go with him you are going to spend the rest of your life alone. We all have the "must have a, must be like, must know this" rules when it comes to a person that aply to be your soulmate.

I must say that all i want is a heart a brain and a hug, i want a smile and a tear, but all i truly want is you...