Likely a bit of both Jen, a little failure because of PTSD, and pride. He doesn't want to admit defeat, he would rather go down in flames than accept he can't handle it. He needs to put pride in a locker and accept help when needed, he isn't capable as he may think he is, and he must accept this, not live in denial. I know I am not as capable as I once was in all aspects of life, and he must realize this is a fact with PTSD. Its not something that just goes away, it must be managed, and he is failing to do that by accepting help to lower his stress levels.