mosp, your threads are a contradiction.
THIS is why it's worrying!
I am deeply concerned and upset for a friend.
He's not a friend, he is a convicted murderer that you are writing to on a scheme.
I like having male friends
OK, but you are also saying that you need to be accepted by a man... and between the lines we know that this is not on a platonic/mates level. Accepted by a man implies involvement. You also say I like that I matter to a man in a good and safe way which again implies emotional involvement. BUT to a man that is unattainable, is a convicted killer and will die for his crimes.
I think I started this thread because I had/have so many racing thoughts going on about this new friendship
You are suffering with this relationship, it's harming and stressing you.
I fear that he may be another abuser and how would I know?
Exactly! you can't know this. Your instinct seems to know that this is not right as it's screaming at the top of it's lungs for you to stop this. You however are ignoring it. 
I just want to take him at face value. And I fear losing him. You can't take him at face value, because you will never look him in the eyes. You can't lose him, because you can never have him. He will however lose his life at some given point in the future. YOU ARE NOT STRONG ENOUGH TO ACCOMPANY HIM ON THIS JOURNEY.
I just wanted to get some comfort and chat about how to deal with the fact that I only know the written version of this man. That's not at all what you were asking of us at the outset of this thread. You said you are drowning, that you can't cope, can't talk about it and don't know what to do.
You won't get comfort from any of us wrt what you are doing with this man. WHY? because we see the harm it's doing to you. If you were OK with it, we'd all be happy, but you are not and neither are we.
Talk to the HW coordinator and tell them what is going on. They will support you backing off a llittle, for a while if need be, and we too will be here to support you through this.
There is NO other option mosp, this thing is consuming you and you are not supported/strong enough to do this right now.
You need to stop. for a while. Let HW manage that withdrawl.