As a mother, I like to support and respect the needs of my daughter. But I do always ask for honesty. Part of learning to grow up is being allowed to make decisions and sometimes this is hard for us moms to do. We want to protect you and we think we know best. But love is unconditional, and it says I will love you and support your choices even if I may not agree.
But, first, be honest...that is how you earn trust.