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Aww, that's a shame. I don't know what you said to him or how bad the situation is but deleting your account altogether seems a bit excessive.
Over the years I've seen so many users just up and leave without ever giving an explanation. One day I'm enjoying their stories, left a comment and a few month later when i want to revisit the story it's just gone, along with the author. So many good authors too, none of their blogs give any indication whats about to happen, and one day they just wipe all traces of existence as if they've never been on fimfic in the first place.
It makes me sad that so many people leave without a closure. They put effort in crafting their stories and leaving comments. Deleting your account after all that just doesn't seem very self respecting.
Sorry for the rant. This is not directed at you but to all fimfic users who left without an explanation. It's their account they can do whatever they want with it but still it makes me feel sad that they'd rather leave people to speculate what happened rather than giving a proper closure.