A friend behind bars

I have recently gotten a letter from a friend who is in Prison who I haven't seen in over 5 years. Way back when we used to be the best of friends, or so it seemed that way. I can't deny that part of our friendship was my attraction for him and that, I believe he took for granted. Its been a long time and I admit that I was quite naive and innocent in believing that the more I did for him back then, the more I cared, and was around- he would one day realize I was the woman he wanted. It never happened. And for that now I am grateful. He never really out grew that phase of being iresponsible and that of course landed him in prison. So anyway going on I received a letter from him and have corresponded with him once about a month and a half ago. It was great to hear from an old friend and I was sad to hear what had become of him and how his life was turning out to be. I said that much in my letter and promised to write again when I could. I tucked the letter away and made a mental note to write again. Time has gone by and I've been preoccupied with a new position I have recently accepted and so I have not written back. So a bit ago I get another letter and it kinda pissed me off. To make a long letter short he asks why I haven't written him and says that he expected more from me. That I should realize that the joys of his days are looking forward to letters. So obviously not hearing from me has been a disappointment. He goes on and on about how we used to be such good friends and blah blah blah. He also wants to know if I'll come visit even though he is in a different state and one across the country at that!
As I am reading the letter I think to myself..."what the hell does he expect?" I am not the one that made an incredibly stupid choice to land me in prison. Not only that but, what the hell do I want with visiting him? I mean its all good that we were friends at one point but the difference between he and I is that I always new I would out-grow that childish phase and go on to make something of myself. I new there would come a time when those friends would be outgrown and I would move on. Now he expects me to act like we haven't been separated for years and that I am still the person I used to be? Give me a freakin break! Why would I want to visit him in prison? What would we say or talk about? Its not like we have anything in common any more. Right?
Yet at the same time I feel for him. I feel for the person he has become and for the stupid choices he has made and the hard blows life has delt him. But really what can I do? I can be sympathetic, but I will not let myself get dragged down too. Is that so wrong to think like that? Does he really expect me to focus on him when I have a life outside of his prison walls. Does he think that in some way I am still waiting for him to come around? LOL Wow its amazing what a 12 X 12 cell will make you believe. So to him...I'm sorry that you took me for granted so many year ago...but I am not sorry that my life has gone on while you sit in your cell and wait for the next letter to come.