I feel like he’s just looking for a reason not to trust me :(

Hi there so I've been talking to my pp for about 3 months now and so far everything has been great :) we usually talk on the weekends and sometimes he'll call me throughout the week. But I can't help but notice something, well I've actually always noticed it but I kind of just ignored it. My pp seems like he's always trying to find a reason not to trust me or he feels like I have some motive because as he says "Why did I just start writing a prisoner? Why Me? "What made me so special that you started  talking to me" "Do you feel safer talking to me than men on the outside?" "What is it?" "It's a risk to doing this so why did you do it?" I seriously don't understand him :( we talked a few days ago on the phone and everything was fine up until he mentioned something about looking younger than his age and I said "Oh yeah I definitely can see that you looked like you had a babyface when I looked you up before" and to this he was like super shocked. He said "Why didn't I tell him this earlier on?" And I said oh I don't know I just assumed that you may not have wanted to talk about your past. He says yeah but I told you what I was in for why did I go looking for something? he went on asking what else did I find out about him? I said nothing all I found was just a article on what he's in for and he just started  going on about how he shouldn't have entrusted me. I seriously don't get it? He says it's fine but I know it's not :( it literally just slipped out and now I'm wishing I never said anything it just came up in the conversation we were having. I kept apologizing and saying I'm sorry and he says it's fine he can understand in a way why I did it because I'm really shy and timid but "Why did I make him repeat it like it was new information?" It really wasn't he didn't go into details about his crime at all which was fine with me. now he could've mentioned it but we talk about everything so I may have just forgotton. I never mentioned it to him either all I said was that he does look younger than his age and he like lost it! Saying that " He's always had trust issues, this is why he can't trust people and he thought it was weird that I just started  "Writing him out of nowhere" like that's the whole point of a pen pal? You see someone that you like or may connect with right?  I started writing him because I was curious, I always wanted a pp and his ad seemed so down to earth he was looking for a friend and so was I. I searched and read through many ads before I came across him. His crime was wrong but it wasn't something insane. There's so many people incarcerated who just need a friend or someone to talk to. And for him to say he shouldn't have entrusted me so quickly really hurts :( This is like really eating me up inside and I can't say anything about it because he doesn't want to bring it up again he told me to just "Get Over It" and "Don't write him a message over JPAY saying that I'm still thinking about it" I know no one is entitled to anything or deserves anything in life but, I really feel like I deserve an apology he didn't have to blow up on me like that. He says since I'm out in the free world and he's incarcerated that we both think differently so he understands why I looked him up but he wishes I would've told him sooner. Being inside he says he doesn't trust anyone like that so in a way I can understand. I like being his friend and I enjoy the conversations we have but I feel like he's always been looking for a way not to trust me and it seems like in his mind he found a reason because I wasn't honest that I looked him up before. Isn't it only natural that you would look up someone's case before you write them? Or maybe that's just me. I just feel really hurt right now and it's nagging at me. I'm trying to get over it but I can't help but feel like I hurt him :( I know anyone's guard has to be up when they're in prison but...idk. I tried to bring it up again today actually when he called (I KNOW I SHOULD'NT HAVE OK!) and he just didn't understand why I brought it up. He said "Didn't we already talk about this? Why are you bringing it up? It's fine I've dealt with it in the past before with people talking about my past" he feels like I just wanted him to repeat his crime over the phone to me. Which isn't true at all! I feel like he may have thought I was going to find something else out about him but I didn't. I'm not that invested in his life to go looking that hard I just wanted to be his friend and show him that there are people out here who are nice and actually care :). I just think he has trust issues like he said before but to get so angry about it, it just really scared me and I don't know if things can go back to how they were. I felt scared and I'm not sure if I really want to talk to him that much anymore. He's the type that can just get over things easily he said, but me not so much I want to talk things out. But i don't see the point since he got so upset. I feel so hurt and he just wants to ignore it.  What do you all think was I wrong for looking him up? I didn't even mention his crime I just said something about his picture and he just completely shut down. I honestly feel like I shouldn't respond to him for awhile but I know deep down that wouldn't be right :/  Do you all think I was wrong for not mentioning anything to him? Or is he wrong for just blowing up on me over nothing? It just seems like he doesn't want to trust me like he's suspicious that I started talking to him. Like he finally found his reason not to trust me. I don't get it :( wasn't his whole reason of joining WAP to talk to someone? Why make a profile If you feel like you don't trust people. I'm sorry this is so long I just really need some advice.