No, Ethan isn't a man-child, and I don't want you to think of him that way. What I said a couple of posts back may have come out the wrong way, and perhaps I'm biased because he's my character, but there's a lot about Ethan's past that you don't know, and there's some very, very good reasons that he's desperately afraid of tying himself to anything, of having anyone fully understand what he can do. Ethan doesn't fully realize it, but since a very early age he's had to protect himself from... everyone. From his parents, from his friends, from people who'd do anything to take advantage of him. Everything has to be about him or by now he'd be dead, or maybe even locked up in some underground lab from which even he couldn't escape, while scientists tried to find a way to duplicate his ability. Ethan's life is extravagant because it hides him from his own fear and depression. That's why he never stays still for very long, and why he so willingly killed Victor at the beginning of the story, even if it punched a gaping hole in his heart.
I was imagining that the letter demanding his suicide would have been delivered with the tape of his daughter, and he wouldn't have shown it to anyone because he didn't want his wife or the police to try and stop him if it got to that point.