My friend has been in therapy since a suicide attempt this summer. He won't tell me or anybody else what it's about, but he gives us each little hints over time. For example, I know that he was diagnosed with a mental illness that can't be cured, he never wants to have children because of it, it's damning (he thinks I'm going to drop him as a friend if I find out), it's something he is rather than something he has or has done, he's never hurt anybody in relation to his problem (which implies that others with his problem could), etc... There's a few more I can't think of. Based on the questions I've asked him and the answers I've gotten, I think pedophilia is his problem.
I recognize that I could be wrong and I recognize it's not my place to think about this when he's so adamant about wanting to keep it a secret, but I'm about 90% sure this is what's up and I can't stop thinking about it now. I want to ask him if this is his diagnosis, but every other time he thought someone else figured out his secret he got very suicidal. Plus, if I'm wrong, it's going to look like my image of him is really warped and I don't think he'd be very happy with me.
For what it's worth, if this is his diagnosis I love him anyway and don't think any less of him. I'd just like to confirm my suspicions so that I'm not obsessing over this, and I also think that if someone he loves knows about it and still wants to be in his life it'll make him tremendously happier. So what do I say? Or do I not say anything?