That kinda reminds me of me at one time; quite depressed, distrustful of people; felt overwhelmed, although I sort of had a small number of friends I still mostly shut people out. I remember one kid though, would oftenly interact with me, funny, nice, but I usually was critical and somewhat bitter toward him if memory serves me..., even so, I don't recall him ever responding in the same way to me, inspite of my shutting him out; I never forgot his kindness, even now I would like to meet him again and thank him and return his kindness.
I think it is commendable that you are trying to reach out to this kid, I think you should keep talking to him whenever you can and try to show a genuine interest in his wellbeing as you seem to be; maybe he will open up one day and interact with you more, maybe not, but the fact that you are reaching out to him, even on this level, could vary well make a critical difference in his life, even if that may not be apparent in the short term; the fact that someone shows an interest; cares enough to interact on a consistent basis, especially when everyone else seems to pass you by, I think, speaks volumes.
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Christian, Aspergian, Recovering Bundle Of Neurotic Anxieties.