Was I wrong to sleep with him?

Long story short I hooked up with one of my best friend’s boyfriends best friend. Her boyfriend doesn’t care but she’s freaking out about it. I originally met him at work, and then found out he was friends with her boyfriend. A few weeks ago me and him almost hooked up at her party she had at her house but she wouldn’t let us bc she didn’t want people having sex at her party (I understood even tho I was kind of annoyed bc we were by my car outside away from everyone, we were both also drunk.)