How do u know u love someone?

Nat said: when u compromised for him, when u put him into the picture when making plans for your future
John said: when everytime u re going to see her again, your heart drops; you love spending time with her doing nothing, just sitting around and brushing her hair; you love the silly little things that she does
... you'll never know 100% sure but u know if you don't try u can't live with the regret
... your feeling keeps on growing even after knowing her for a long time