I understand where you are coming from as far as disclosing to friends. When I first began recovery I was one of those people who felt like telling everyone but I reined in this desire by keeping it to family and close friends. I shared some of your fears and similar experiences when I told my buddies.
Basically, they were as supportive as any non-victim could be for guys like us. After all, we use our personal experiences and empathy in order to understand each other and provide support. Fortunately, many of our family and friends lack any direct experience with CSA. Unfortunately, especially given the complex/widespread after effects of CSA, this means non-survivors have a very hard time understanding and offering support in any meaningful way. Most of the time, I am sure people will offer their ears but beyond that there is not much a lay person can do. Additionally, an issue like child rape is difficult for many people to discuss precisely because of its profoundly negative nature.
In short, I am sorry your good friend seems unable or unwilling to provide much needed support for your recovery journey. I highly doubt he means anything personal by it especially given his continuing communication with you. I will not presume to tell you exactly what to say to him. However, I think it would be perfectly alright for you to tell him about your experiences and how his friendship has helped you.
As far as what he is thinking that is hard to tell. It may be he does not know how to respond, is uncomfortable responding, and so on and so forth. I think as long as he accepts you for who you are, including your status as a survivor, he is a good friend to keep. Luckily, there are also many other avenues of support for you such as therapists, group therapy, survivor literature, and sites like this one : )
"Life is like this dark tunnel. You may not always see the light at the end of the tunnel, but if you keep moving, you will come to a better place." ~ General Iroh