Eventually, if you don’t let your guard down, it will push him away. It’s actually appropriate and normal not to have your guard all the way down when you first meet someone you don’t know, but as you get to know them, it’s normal to trust them and the world.
Not everyone is going to like you back the same way you like them, but that’s part of the dating game, and you have to understand that if someone doesn’t like you it’s much better for you to find out than think otherwise.
I hope that helps! 🙂