Roommate?

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I don't understand why my roommates are so selfish. I always believe that we can be really good friends. But they don't understand me,and do their own business,even won't help other when she has trouble. I still remember that one of my roommates said: You're not so important to me. Is it true? I don't believe that we don't have friendship. It has been two years,two years.How can she say that? I really feel disappoint, and maybe i needn't treat them as before. Coz i don't have any feelings with them! Why the sky is so dark, and why i am so upset. Now i can't laugh, i can't do anything. That's why?