Can you dwell on your past?

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We know,we can't be all things to all people,we've ever done many wrong things,even that can make you lost something important for you.so am i.i've hurt my best friend,because i'm the one who result in she break down with her boyfriend,but that's not my fault,and i'm so sorry to my friend.i found that she treat me not friendly any more.I don't know what to do,i don't miss this friend.I tried to explain,she's unhappyand .so all fellows,do you?