I understand where you're coming from, Soz.
Yes, ideally, it would be good not to say anything to him. Why? Because he will see your insecurity for what it is.
He could respond in all sorts of ways. He may walk away, lose trust, or question whether he can handle that. Or he may use it against you (i don't think he is this sort, but they are out there).
Or, he may accept it and be able to help you through it. He may have insecurities of his own that require understanding.
My instinct is to talk to him about this, because it is who you are right now. And who you are right now is who is in this relationship.
When you talk, simply keep it to what is relevent. You don't need to (and shouldn't) indulge in listing off everything that is bothering you or that is making you question the relationship.
You can just take a breath and say "I'm stressed and could use some extra understanding right now. I hope you understand."
That usually does the trick of dispelling the wondering "does he still care?", bc he'll most likely respond with something like "oh ok. no problem." and may even get him talking about things himself.
Better to find out how he deals with it now, and to practice communication and above all - Not Running Away! . Face it head on. Let him in on who he is dating straight-on, so he can make knowledgeable decisions without having to guess about your actions and why you may be acting weird at times.
I think the worse thing you could do is to keep this all to yourself, allow it to fester, and then do something on impulse that would hurt everyone more in the long run: like running away and coming back, back n' forth, obsessing over when he'll text, or creating an atmosphere where he starts to view you as unstable and needing to be 'managed'.
I may be wrong..this is just my opiniion..but I think you Not Hiding is the most important part of this whole thing. Even more important than whether this relationship lasts a long time or not. It could be a great chance to learn about yourself. You're scared - so keep going. See this through.
p.s. No running away!