Please help me

[Lindsey]

It was Kyle's party and my ex went because he is friends with Kyle, they work together. I wasn't jealous about the girl, we've been broken up for a long time and we're not FRIENDS but we are civil with each other. He is not someone I would ever want to date again. I just think it was absolutely disrespectful for him to be like that with a girl in my boyfriend's house and on my boyfriend's BED. We're not college students and it wasn't a loud crazy party. There were about 25 to 30 of Kyle's friends who came over to have a few drinks in celebration of his house finally getting all finished. We're all adults and everyone was acting like it except my ex. It was absolutely disrespectful for him to act like that, and everyone was feeling uncomfortable. I was trying to ignore it but him going into Kyle's bedroom with that girl and closing the door was the last straw.