SUBREDDIT: r/relationship_advice
TITLE: [20/f] I hurt my boyfriend (21/m) and I need to fix it
POST: I messed up and I need to fix this;

I did some things to the one person I love more then anyone that cant be undone, however, there is one situation that still needs to be dealt with and I have no clue how. 

My boyfriend has a friend who is self conscious, with no reason to be. He's a good looking guy. That being said, when I found out that he had low self esteem, I (stupidly) thought to myself that maybe I could fix that. One night I randomly decided to message my boyfriend's good friend, whom I had only met twice.  I don't have the message anymore, but it was along the lines of, " I think you are very attractive" and " I hope we can keep this just between us so that nobody gets hurt". I regretted sending him the message immediately afterward. To make the situation even more complicated, I found out that my boyfriends female roommate is now dating this guy. 
He never answered back, which I am very glad about. I didn't think things through; if he did message back, I wouldn't have known what to say. I am not attracted to him, I just think he's good looking and it's always nice to hear compliments like that. 

Anyways, my boyfriend saw the message one day because I left my facebook open while I was at work. He says I need to fix this, but I really don't know how. I wish I could turn back time and not do it at all, because I feel terrible. I guess I need to make it clear somehow that I don't like him, that I was just trying to give him a compliment... but without being a bitch? I really don't know. Its just really awkward seeing this guy for both me and my boyfriend, and I need to do damage control. Any advice is appreciated.
TL;DR: 
I told my boyfriends best friend that I think he's hot and my boyfriend found out and wants me to fix the situation.