How can I help him when i barely know him?

all he needs is someone to talk to about it and stick up for him..jus say i like ur shirt or somthin and hes prob not used to socializing so it make look like he ignores it..but in reality you jus made him feel a whole lot better...if u get close to him tell him theres nothing wrong with him and that hes a really cool kid..people like this will get attached very easily but if u get his confidence up enough he will be himself around you tell him what u said to..