Remember what we said about men not wanting you checking up on them all the time? They shouldn't feel like they have to do that for you, either. Paranoia and jealousy kills relationships; as much as an unpredictable wild child can be sexy in the short term, they don't tend to make great long-term partners.
This isn't a hard one to live up to - if you say you're going to do something, do it. If you say you're going to be somewhere, be there. Don't keep secrets from him, don't give him reason to doubt your word, and don't make him worry if there's no reason to. "Treat them mean and keep them keen" has always been a lie; trust is a major investment for men to make in people and once they give it, you also get their loyalty. Don't abuse it.