How do you know when he/she is your soulmate?

A soulmate to me means a person whom you love with all your heart and soul. Your heart should race from time to time whenever you are really close to each others bodies. They should make you smile naturally and the moment should be as authentic as precious diamonds. That's how I feel about my hubby. He is my soulmate.

How do you know when he/she is your soulmate and is your soulmate really the one your destined to be with for the rest of your life?