u/Hachipatchi

Hi, I’m 24F, and my bf is 25M. We recently went on a trip with our friends to Miami, where we stayed at an air bnb with a hot tub, sauna, swimming pool. Bf has a girl best friend, A, (24F) who he is very close to. The majority of his friendships have always been girls, so I’ve always been fine with him hanging out one on one with other girls, and even letting them stay over at his place on the couch when I’m not there. The only boundary I’ve set is that on anniversaries and special days, I don’t want him to hang out one on one with another girl. For context, we are long distance the majority of the time.
At this trip, A was in a bikini and bf was in his swim trunks. We were in the hot tub, but he kept getting out to push her into the pool, which I was okay with. Then another girl (in bikini) and A tried to both wrestle bf into the pool, which I was starting to feel a bit weird by as he was putting his arm around them and there was a lot of physical contact, but as he was trying to not get into the pool I understood. However, later on he got out again, snuck up behind A, wrapped his arms once around her waist and once under her bikini top so that his bare chest was flush against her bare back and kind of twirled her around, carried her to the pool, and then dropped her in.
I’m torn because the entire time I was sitting and watching in the hot tub, and it feels like this feels like a scenario that most couples would avoid. It feels like he is taking advantage of me being fine with his female friends to go further. However, I know the kind of person he is, and I know the thought didn’t even pass his mind, that it was all fun and games with him. I expressed my unhappiness with him, but am I warranted to react this way in the first place? Everybody else in the hot tub was also just sitting there watching, which made the two of them messing around feel more flirtatious.