Is AUTHOR wrong in the post ? POST : Ok, so there's three people relevant to this story: Me, C, and S.  S and C are both girls and I'm a guy.  S and I have been friends (or so I thought) for a while and C is newer.

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We all work together in an office with about 100 people in it.  We're in different departments (I'm an accountant, C is in Business Development (Sales), and S is in QA), but we're in an industry that is full of older people and we're in our mid-twenties, so we tend to hang out together.  

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So last March, it was C's first or second week here.  A bunch of us went to happy hour after work.  Everyone leaves one at a time and C and I are the last two left.  We have one last drink together, end up at her place, and sleep together.

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Now, I was a little worried about how C would take this at first, but a few days later, she pulled me aside and said "Hey, just want you to know that I had fun, but I'm not looking for a relationship or anything."  I was totally relieved and told her we were on the same page.  From then on, things were totally cool between me and C.  Not even awkward at all.  We ended up hooking up one more time a few months later, actually.

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A huge mistake I made was telling S what happened.  She was the last one to leave C and I alone, so she asked me what happened the next day and I told her.  Probably not a smart idea, looking back, but I thought we were friends and she seemed curious about it.

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Like I said, that was 10 months ago or so.  This morning, I get pulled into HR and was told that S had filed a hostile work environment claim against C and I.  She said the knowledge of us sleeping together caused her to be "scared to come into work and lose sleep at night".  C and I are both being formally written up and we've been told not to ask S about this or it will be considered retaliation and harassment.  This is actually the first day of a two week vacation for S so she's not even here to talk to (she filed the claim her last day before the vacation, last Friday.  Probably on purpose).

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Honestly, I was completely blindsided by this.  This happened almost a year ago and S has never given me any indication that this info made her uncomfortable or that she felt the work environment is hostile.  I have noticed that S and C have been falling out kind of lately so maybe this is a way to get back at C? I'm not really sure.  Didn't see this coming at all.

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Talked to C about it at lunch today and we're still cool, amazingly.  She's not even really mad that I told S, but sh'es just as bewildered as I am.

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So, what's your verdict reddit?  Am I the asshole here?