Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: So this is something I've kind of struggled with for a few years. To set the scene, this girl and my buddy have been together about 5 years. There's never been even the slightest hint of flirting or anything even resembling that.

I've always considered myself an extremely loyal friend. Especially to this guy. We were inseparable throughout our teenage years and to this day I'm still good friends with the guy. Once he or any of my friends even show an interest in another girl, they have always been completely off limits for me.

Until this. One night, me and another (different) friend went out on the town, and got twisted drunk, to the point that no bar would let us enter. My friends girlfriend was one of our only friends with a car at the time, so my other buddy called her to come collect us and bring her to mine so we could carry on the drinking. 

The drive home is where my memory cuts out. 

Next thing I remember, I'm having sex with my buddies girlfriend. I kinda panic when I realize what's happening, and end it and go to sleep. Wake up the next day, and she's telling me that I made the first move and that we obviously can never tell anyone.

Honestly, my whole world was shaken up. It's been a couple years and I still feel physically sick typing this. I've never been able to tell my buddy, as it would kill him. Weakness on my part, I know. 

Anyway, what do you guys think, am I the asshole?

sleeping with my friend's girlfriend