I have a theory that not everyone knows what being a boyfriend/girlfriend is. My other theory is that I don't think everyone knows what being an ex boyfriend/girlfriend is. There are certain things you can do as each and holding hands with an ex is not one of them. It COULD mean he still likes you however, most physical contact after a breakup means they're looking for post-breakup sex. If he asks you out, then it's probably OK to assume he still likes you but for now, just look at it as he's looking for some action.