I'm not a girl, so I really can't imagine how girls can worry about "problems" that guys don't even know exist. If you're happy when he texts you, why do you have to give yourself an anxiety attack thinking what it means and whether you should reply? If you think that's being clingy and you don't like clingy guys, then fair enough. But that's not the impression I got from your post.
And him having lots of female friends does not make him any more or less likely to cheat on you. Presumably there's a reason why he wants to go out with you and not those friends.