Life's traumatic events can cause changes in all of us. I know personally. Sounds like intense therapy is needed for your spouse and you, and if he won't go, then you go for your own mental health.

You haven't given much info, but since you noticed such a change in him, it sounds like he was really affected by the accident. That is normal if he feared for his life, or even his way of life/livelihood. Sounds to me like something he needs to be consistent with...therapy. Does he realize how he's changed?

Welcome to pc Rhyanna! TC