My husband doesn't think he has trauma

My husband always says he doesn't need therapy and that he doesn't have trauma. Even though his past does effect his present. He was severely abused by his mom and tried to run away when he was 16 but police brought him back and she beat him and chased him around the house with a bat. He climbed on the roof of their house and she followed him trying to grab onto him and he kicked his mom square in the face as hard as he could and she fell off the roof and did not survive that. He claims he doesn't remember much after that. Obviously he wasn't charged because it was self defense and he had the beaten in face and bloody body to prove it. He went to live with other family. He's never seen a therapist because his aunt he lived with didn't believe in therapy. My husband believes he's not traumatized yet he refuses to go anywhere too high. I clean the gutters because he won't climb up the roof. And it was obvious this fear started AFTER that. He always has severe night terrors and when I wake him up he screams don't hurt me mommy. How does he not think any of that is trauma? I don't understand how he thinks he doesn't need help?