Group sex with my bf 21f

So I’ve been with my boyfriend for a little over two years. About a week ago I finally gave into one of his requests. He’s always wanted to see you have sex with another girl. It hurts. I was disappointed and actually upset with him, but I finally gave him and me and him had a threesome with his best friend. He absolutely loved it and so did the friend. I don’t want to say I hated it, but I definitely did it for them not for me. Now he’s wanted to add more friends into the group.