I am wondering if narcissistic personality disorder is what causes this. Does anyone know? Also, how would a woman go about telling a man that he has this problem without alienating him? He is a very brilliant and extremely kind and generous man, he just has a problem with his ego. Is that caused by insecurity or not feeling loved? I am not sure. I know I would love the man to pieces if he would let me. I doubt he would want any other woman's attention, if he had me around.