i have the same prob sometimes, worrying when i send him texts that he'll just get pissed off, coz he takes a while to text back too. and i have to ask him qus rather than him just spontaneously tell me about things that're going onj in his life. but then i ask him about it, and he reassures me that he loves getting the messages, even if he doesnt text back, and is happy to answer qus i ask but he doesnt wanna bore me with his life details otherwise. just talk to him and ask him how he feels. You havent been together long, so it may take some time for him to open up to you and stuff, dont worry about it