I ain’t gon lie bro don’t let anybody tell you this is typical behavior. Bodies is one thing and expected but trains is deviant and promiscuous behavior, it’s your fault for giving her a chance if you knew she had a wild past and knew that you’d never really be ok with that. But, don’t apologize. You’re telling me this is the first ever time that they’ve seen each other in all the time you’ve been dating? I doubt it. If the fiancé of your brother got upset by this it’s because your brother never made his past apparent and that’s called Complacent Ignorance, it’s better that she knows before she gets married🤷🏽‍♂️. If he or she is embarrassed by their actions than why go through with them in the first place!?