Hi. i had gone through your concern. It seems to have psychological erectile dysfunction. because he had past history and had erection. so it might be chances to have stress or any psychological reasons behind this. Psychological evaluation and need to be addressed following areas. 1st is life style stress and busy life style make u fatigue and secondary to this it makes less desire in sex and erectile problems 2nd is relationship free communicative and mutual understanding will help sex is mutual act so try to do mutually and tell your problem to partner this will reduce your anxiety and able to erect easily so stress free lifestyle and mutual communication will help Physical health and routine check up and fit physical health is necessary psychological soundness is must and sun set focus method for erection is very useful .Medicines like sildenafil,, tadanafil, tetrafol plus etc Do take advise from doctors Take care.