If he was interested in finding a steady relationship, he'd be trying to work on his commitment issues. He's not. It seems like you want to believe that if he'll just stick around you'll prove to him that you're not like the other girls he's dated, and everything will work out beautifully. If he's bailing out when things are still so fresh and new, though, then you can bet he'd bail out once the honeymoon portion of the relationship wears off. He's telling you he can't offer you what you want. Believe him. You'll only end up getting hurt worse in the end if you start thinking otherwise. Just let him leave, and break off all contact with him now. The more you stay, the harder it will be later on.
“This planet has - or rather had - a problem, which was this: most of the people living on it were unhappy for pretty much of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movement of small green pieces of paper, which was odd because on the whole it wasn't the small green pieces of paper that were unhappy.” ― Douglas Adams, The Hitchhiker's Guide to the Galaxy