need to be bothered?

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our group never experienced fight/s or any miss understanding/s.. until now.. i don't know if i'll just ignore it or not, but still... though we're not his best friends. Does that mean that we don't have even a bit of right to know what he's thinking/problem? and i'm getting to get worried.. just as when i thought that it's turning well, something like this happens.. because of a simple thing.. i can't consult him (shy). what can i do? i don't want our group to break..