Is AUTHOR wrong in the post ? POST : Some background: I have known "Amy" and "Trey" since middle school. We've never really been friends but we've still kept in contact over the years from mutual friends and get togethers. Trey is roommates with some of my good friends so I see him a lot more often than Amy but she stays at his house during weekends semi frequently, but I've never really spoken to them beyond pleasantries and light conversation, except for one time a few years ago when I got really drunk and came on to Trey but he denied me because he had just started dating Amy (which i was unaware of because we aren't really close). Amy heard about it but she wasn't mad because she knew the fact that they were dating hadn't gotten to me yet.

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About two months ago, I went to a get together at Treys house and Amy was away visiting family. As things started winding down and my friends went to bed, I sat down in the kitchen and started playing with the dog. Trey then sat down next to me and started playing with the dog too. He then came right out and asked me if I wanted to go to his room and suck his dick. I was pretty shocked and only really managed a polite "no" and then Trey went to bed without pushing it and I left and went home. 

I didn't want to tell Amy for a few reasons. First one being when I came on to him while they started dating awhile ago and I thought she would think I did something to encourage him to say that. I also thought maybe Trey wasn't in his right mind because he was drinking and smoking all night and I didn't wanna blow up his life over a mistake. And lastly, I don't believe i'm close enough to either of them to get involved in their relationship like that.

Since then I've seen Trey a couple times and everything has been totally normal so I figured he was fucked up and forgot anything happened, while I was feeling guilty for not telling Amy.

Then last week, Trey and I were by ourselves outside smoking and I brought it up. He said he's been waiting for me to say something about it , he apologized profusely and said he wasn't in his right mind. I said that that was what I assumed and I didn't say anything to anyone about it and just ended up forgiving him. His apology seemed really genuine but I usually take things like this at face value.

AITA for not letting Amy know that her boyfriend would have cheated on her with me and could potentially be cheating on her with someone else?