sounds like he doesn't like texting, a lot of people find texting a lesser form of communication and prefer phone calls, so stop texting him so much and pick up your phone and talk to him where he can hear your voice not just read letters on his phone. to me he sounds like he is invested into you, if you are becoming too clingy or needy with him, you will chase him away, just relax. he doesn't have to text you back or call you back when you think the amount of time has passed is enough, he does he when he feels he has time. chill out more and enjoy your new relationship.
When I tell the truth, it is not for the sake of convincing those who do not know it, but for the sake of defending those that do.
William Blake