He’s trying to tell you he’s not interested in dating you seriously. What you do depends on what you want. If you want a serious boyfriend, he’s not it. If you want him when he wants you, then he’ll probably be there. Probably.
When you meet someone in a whirlwind — and even though you met him a month ago, the dating process was a whirlwind! — things often end just as abruptly as they started. That’s a good rule of thumb to remember. My old school rule is to use the first three months of dating someone to decide if you want to continue dating them. If you do, use the next three months to decide if you want to be monogamous. This may seem slow and boring, but if you’re interested in something serious, then you should get serious about really taking the time to get to know each other…
I hope that helps!