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It's hard to find a trusted friend. And it's even harder to keep the trust between the two of you because it is often that people says words that are not true in no regard of the others feelings. And sometimes a "Sorry" doesn't cover it.
There is a wording in mu country: "To have a trusted friend means if you kill someone, to call this friend with the question "What to do?" and the answer to be "Wait for me to get the shovel and let's dig the grave together." And that is what a trusted means - to have someone to rely on no matter the circumstances or the consequences.