Trust is a crazily treasured commodity because it is something that has to be built. You can look at someone and instantly think they are attractive, or even immediately take a liking to them. But you can never automatically trust somebody.
Earning trust is a vital component in building any other part of the relationship. Without it, everything is shaky and ready to collapse.
Having honest faith in a guy doesn’t just mean you believe he isn’t going to cheat on or lie to you. It means you’re confident that he will be there when you need him. It means you feel safe in opening up to him, in sharing your deepest fears and insecurities. He’s not going to throw a confession back at you in an argument, or tell someone out of spite.