Dear {Name},
I've been getting the sense over the last couple of days that I've done something to hurt or upset you. I've tried to approach you a few times but I'm not quite sure how to ask you what I did, especially since it seems like I should know what it was.
I can't apologize for what I don't know, but I can say that I am so sorry if I hurt you in any way or made you feel bad at all. I would never want that, and seeing you so down makes me feel terrible. I hope we can talk it out, whenever you're ready.
Sincerely,
{Name}
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