<human>: My awesome boyfriend has just informed me that his best friend asked him to tag along on a trip to Vegas for a bachelor party.  Honestly, any other friend, I would not mind or even bat an eye.  His best friend has a girlfriend, but on the only two occasions where we have hung out in the past with him without her, he has crossed lines with other girls.  The first time was a beer fest fun-day, he and my good friend hit it off and by the end of the night, the two of them were naked in a bedroom together.  Flash forward to the next time he hangs out with us sans GF and he is making out with another friend of mine before telling her he has a girlfriend!  My boyfriend and I both discussed how we don't approve of that behavior.  And my past and insecurities really flared up big time and caused a bit of a riff between my bf and I over it.  I *know* that *I* need to let it go.  And I want to use this trip as a way for my own personal growth in letting this crap go.  Any advice would be helpful.  I'm not the jealous type, but like everyone, I have baggage and stupid issues in my head.

Can you provide a brief overview of the text?
<bot>: BF Wants to go to vegas with his friend that has on multiple occasions cheated on his girlfriend in front of me.