Honesty always helps , in your email make clear the way you feel , the way you were feeling in the lead up to the argument.
Be sure to hold a tone of responibilty of your emotions , be honest , and try not to ask too much from your friend. Firstly aim to communicate how you feel , and then listen/read to see if you are on the same page
That can help clear the air , to pave the way to move forward
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