My friend and boyfriend were flirting, but she kept rejecting him. Why would she reject him?

So I (f21) have a friend (f24) that I am kinda close with. My boyfriend (m25) and I have thought of her during sex. I get turned on when my boyfriend flirt or messes with another girl.

Recently, we went out to a bar together, my boyfriend and her were all over each other. Like holding hands and hugging. She grinds on my boyfriend and vice versa. While we were dancing together, I saw my boyfriend touching his was up her inner thighs. She didn’t push him away. She whispered some stuff to him and they started whispering things to each other. While they were whispering to each other, they were hugging and tugging each other. While they danced together, my boyfriend also touched her pelvic area. All this was done when I was next to them. But at the corner of the room. Then when we walked back, my boyfriend walked in between us. They were holding hands and hugging a lot. I saw my boyfriend holding her hip and waist. We went back to my boyfriend’s place to crash at Bc his place is the closest. I was removing some stuff in the living room while they were talking. She mentioned some moles on her legs and he touched up her inner thighs, close to her libias. She was sitting while my boyfriend was kneeling down in front of her. He kept touching her legs and she giggled a lot. Their faces were so close together. Then when we were going to go to sleep, my Boyfriend slept on the couch while she and I slept together. The next morning, when I got up to go wash up, my boyfriend went to sleep next to her. He asked if it’s okay for him to sleep on the bed and she said sure. While they were on the bed, he breathes into her ear. She moved her hair to the other side. And he asked if she wanted to cuddle but she said no. After that, she kept rejecting anything that has my boyfriend involved. Although she still text him about small stuff. While we’re on this topic, what should I do as well? Do you have any ideas how might she be feeling?She and I still talk like normal.