My boyfriend and I started out very similarly too. I just want to mention that you've only been with him for 6 months, which isn't a huge amount of time, especially to get used to someone and get into a pattern with them, if you know what I mean. You can't force them to change or anything, especially over night. Over the course of several years and many, many conversations, my boyfriend and I have found a rhythm for our communication. He started out very quiet, not always responding, and we were on the phone! I constantly felt like he must have fallen asleep. But eventually he began to fell comfortable enough with me to really be a part of the conversation. Granted, I had to tell him what I wanted from him and give him specific examples, but really, it's just a slow process of getting closer to each other and as comfortable with the other person as you are with yourself. Also, what Fool Zero mentioned is a very real possibility. If I let myself get too frustrated and my boyfriend would see it as me yelling at him and being angry with him, and that would make him clam up more. It's got to be a slow, gentle process of getting closer in all areas of your relationship, not just communication.