Original post by MissterySome of the responses on here are from absolute morons.
The first thing, above all, to remember is that you know this guy better than anyone here. All we have is a few paragraphs of information to go off, so anyone telling you they know what's going on his mind is lying. For the love of God, if you really, honestly believe he's genuine, give him the benefit of the doubt. Don't condemn him from the accounts of a few strangers on the internet.
Anyway. I don't think he's that bad. Two of my exes were just like this. I'm now good friends with both and they're still just like this. It's just the way they are. They're two of the kindest, most decent people in the world. They just don't see certain topics like this as off-limits. It's not them being insensitive, or manipulative (hah) like some people have said. They just really think it's a relevant conversation point.
To be honest, I find the easiest way to deal with it is to just push past the insecurity. He's chosen to be with you, he wants to be with you. If you ever feel like he's deliberately not treating you right or ignoring you then you have cause for concern, but don't worry about him just having a different idea of what's acceptable conversation. Like it or not, these are things that happened to him, he wants to talk about them, and asking not to hear about it never makes it go away. It's more healthy to listen, be understanding, and accept his past.