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write a letter of apology to your friend.
user
dear friend,

i want to start by apologizing for my recent behavior. i know i haven't been the best friend lately with my outbursts and lack of understanding, and i regret not being able to communicate my feelings better. i know i have hurt you and i'm sorry.

i also want you to know that i appreciate our friendship and all of the time we have spent together. i hope you can find it in your heart to forgive me for my actions, and that we can move past this and continue our friendship.

sincerely, 

your friend
assistant