in some ways just from what you have written perhaps him opening the door was him telling you how down he is, how he doesnt want to be here any more. i think that may have been his way of telling you, his way of asking for help. i could be wrong but if he wanted to he could have left the door locked. what ever happens you will have to give him the benefit of the doubt. if you go overboard it may push him away. not saying that will happen but its been known to. for me personally if my family askes me over and over how I am feelig and am i ok it kinda makes me upset especially if I say fine. Usually I talk when Im ready. Just letting him know you are there and that he can come to you will be important