His behavior can be also related to his substance abuse issues. You've mentioned that he had received counseling. Couple's counseling may be something to look into if he had not tried it with you before. That way you can confront him with an objective person present of his actions and how they affect you and the relationship.
If you believe that his PTSD is still unresolved, EMDR therapy would be quite appropriate and helpful. Of course, you want to really address how his actions impact your relationship since he is in denial.
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