Confident men are always the guys you know you can rely on. Why? Because they do what they say they are going to do every time. They follow through on commitments because they only say the things that they mean.
Being reliable is part of being confident. A confident man will not agree to do something he doesn't fully intend to do. Instead, he'll say what he can do and follow through on that. It's part maturity, but mostly confidence that allows the men we count on to be just that. It's pretty simple: Don't agree to anything you don't fully agree with and don't do the things you said you wouldn't.