Husband wants a DNR

My husband has been healing from a motorcycle accident. His motorcycle was hit by a driver under the influence. He had some brain trauma and had to get surgery and he coded during the surgery and they brought him back. We have 5 children together and I'm a sahm. I've been helping him and he told me today he wants a DNR. He doesn't want to be resuscitated again. He remembers the car accident and was conscious mentally all the way up until he coded and he remembers what it was like to die. He said there was nothing. Everything was black and he has had an existential crisis since he was brought back. We talked about this for 2 hours and he started crying and saying it doesn't feel right that he's still alive and almost like he played nature and the feeling of his life ending was awful and he just wants to go if this ever happens again. Why this hurts me is he would rather make me a widow of 5 kids because he doesn't want to be brought back if there was ever a situation where this happened again. It became a small argument and I didn't want it to be because he was really emotional but it seems selfish for him to not want me to at least try to bring him back. He wants to leave me and our 5 kids. Am I in the wrong?