My girlfriend’s top fell off at a party

Me and my 19F girlfriend were at a small party at my friend’s house. He lives on this lake, and has a dock so we brought clothes to swim in. We got changed into our clothes and when I saw what my girlfriend was wearing I was a lil annoyed. It was the smallest bikini I’d ever seen her wear. The dark edges of her nipples were showing if she bent down even a little bit. And the bottoms were basically a thong. She jumped into the water and her top immediately fell off. It took her a second to realize and by the time she did, her bikini top had already sunk down. She tried to cover her boobs with her hands, but had to swim to look for her bikini, so her boobs were completely out. I could see all my friends staring at her body. She looked for a while but couldn’t find it and eventually gave up. She apparently gave up trying to cover her boobs too. She was just swimming and hanging out topless. My friends started giving her more attention, and she was talking to them while they stared at her naked. One of my friends picked her up in the water, trying to throw her back in the water. But she just wrapped her legs around him and held onto him. Her boobs were pressed up against his face, and he held her like that for a while. Several minutes she was holding onto him. I feel like they all think of her as a slut now.