Many things are given and easily taken away. For example when something goes wrong I will give people the benefit of the doubt. When they keep going wrong then that benefit must be earned back.
To really trust someone then it has to be earned. Trust is not given unconditionally. Each challenge or every time someone is there for you then a little bit of trust is earned.
Family is given unconditional love. There is a blood bond that cannot be broken and that will always be there. When this unconditional love is given it is received back in full.