What is a friend?
MerriamWebster online writes: a person who you like and enjoy being with; a person who helps or supports someone or something; one attached to another by affection or esteem; a favored companion.
Middle English frend, from Old English frēond; akin to Old High German friunt friend, Old English frēon to love, frēo free. First Known Use: before 12th century. Among its synonyms are alter ego, amgo, buddy, chum, compadre. comrade, confidant, crony, familiar, intimate, pal.
What is a Freund?
dwds(dot)de writes: Vertrauter, someone you can trust; jemandem innerlich verbundener Mensch, a person who is especially close to another. Old High German (8th Century) vriunt, friend, next closest, mate, relative.
This is not the place to address how Americans and Germans diverge in the understanding of friend, friendship, what it means to be a friend. But here is a thought:
Is it not the true friend who has your best interests in mind, and therefore is willing to risk the loss of your friendship in order to convey a message which is painfully important for you to hear?
Formulated differently: What true friend, who sees that you are on the wrong path, would not speak to you about it?