Trust is basis of any relationship. 
Trust is a fundamental nature of human being – you either trust or you don’t and it is your inner quality.
It has nothing to do with another person’s action or word. 
But only when 2 people come from 100% trust they can build a relationship of love.
Love without trust is just a convenient arrangement.
Love is a paradise one builds on 3 pillars – unconditional trust, total caring & absolute sharing.