Rant - Best Friend Cheating

Just a rant, really... one of my best friends from college came to hang out at another of our mutual friends house with me late last night. Me and my other friend had been enjoying a super nice night with some snacks, wine, and watching a documentary on heart attacks (so SUPER laid back). Our friend had been saying she was going to stop by to join up, but it kept getting later and later. Around 10 pm, I was going to leave for home (after two glasses of wine over 5 hours) when she showed up. And by showed up I mean STUMBLED into the house and started slurring about how she tried to get there earlier but the work party she was at was just SOOO fun. I was shocked to see that she had driven a car in that state and immediately offered to drop her off at home on my way. She wanted to tell her story... about how on an out of town trip she slept with her boss two different times!! 🤢 She has a boyfriend of two years and, per herself, her boss has a fiancé with a wedding in November and three kids with that woman. ... I was appalled. She had no remorse or intention of tell her boyfriend or ending things... just to keep working at the same place under the guy she slept with! I don't even know what's more disgusting... her completely disregarding all the feelings of the innocent people that are involved or her driving while so obviously intoxicated!