Ethan remained calm, he didn't want to argue with him, as he knew the last decision lies with Diana; so he had no reason to argue with Nathan.
"Come home with me." He said.
Nathan expression changed instantly, he had assured himself that Ethan won't bring it up, since they've moved to Diana topic. But it seems this clever man knew how to handle his feelings as well.
"Ethan, it's not your fault, I do not regret my life; so you have nothing to worry about, and if I have to choose again; I will still chose to not return home, course I'm okay with the man I become." He said, not holding back his feelings, he wanted Ethan off his back for good. There are people who will want to kill him on the spot, and if they mistook Ethan as him, he might get killed.