Clara was already at Jenna's house early in the morning, because John had told her that Jenna had insisted on going to Japan where Ryan and he were going to find a donor for Jenna.
The girl grumbled at length, because she was worried about her best friend's condition—which of course was just a passing wind. Jenna wasn't in the mood to compromise with anyone. He wanted to do this to make sure Ryan wouldn't go through something scary like before.
It wasn't Ryan who was scared, it was Jenna. How come? The thought of Ryan being a victim in that plane crash, and leaving Jenna alone, really made the girl faint instantly.
He couldn't bear to lose Ryan. Especially for now, having been with this man for a few weeks, feeling how Ryan treated him, he really didn't want to replace all of that even with his health and long life.
If it's not with Ryan, then he doesn't want to live life.