Why does he only want to text? We never talk on the phone!

I've been seeing this guy for over two months now. I met him online. We started talking here and there a few months ago over the e-mail. We got to see pics of eachother from or online profiles and one day he saw me on the street and sent me a message saying I saw you earlier. From that point on we have been seeing eachother often, almost every other day. It is only at night, we don't even have sex often either, he just wants me to come over and lay with him. But the problem is, now that we have physically been involved face to face..he doesn't talk much. I talk to him mom and his grandmother, when I come over and I've met some of his family. He even let me met his son. BUT! He only wants to text and I wonder why I can't get anything out of him. He constantly asks me to talk to him. He asks me questions but, he never calls me. If I call him, he won't answer. I get the vibe that I am bothering him. Like, I don't know how to read him at all. I guess the challenge is what attracts me. BUT AGAIN!!!All he wants to do is text. I like the little bit of personality that I have seen but, he only wants to text and occasionally have sex. What's that about?

Update: August 09, 2009.
He does not have the capacity to take me out like that. His mother suffers from ALS and he is her primary caretaker. She is in other words dying. So I have taken that into consideration and tried to understand that he is going through a lot right now with having to take care of his dying mother. I really like his mother she's great. So his idea of hanging out is to come over. Occasionally, he does have a free day where he can go somewhere because a family member has relieved him and we will go somewhere. I have met his friends. I get the vibe that he's interested.I do spend a lot of time with him, at least 4 times a week and it's him telling me(or should I say texting me)and asking me to come.Mostly at his home but my main concern is that the communication is at a minimum, and as far as sex that is at a minimum too. Personally, I think that I am expecting something from him that he doesn't have to give right now. But, I still do think that he can pick up the phone and call sometimes. When he was pursuing me, he called.