Im so sorry for the deep sadness your feeling, maybe you dont visit him as much as you think you should because you dont want to face to harsh reality of the situation. everyone grieves differently, some poeple can be right there in the middle of things and some poeple cant be there because its just too painfull. But i do think you might regret not visiting alittle more, and that regret might be very painfull to deal with ontop of the grief of loosing him. and i know its so hard to see him, but just think of the happyness you bring him when you do. Hang in there, i wish you all the best.