[ Friends ] Open Question : Friend drama? Advice please?

So, I have two friends i met in class. Let’s name them 1 & 2 . I hung out with 1, and we got close , and then I found out she’s friends with 2 so we made plans to hangout. 2 invited me to her bday party shortly after (she has a twin sister) and I became close with the girls that she invited to this party. But then I started noticing they wouldn’t invite me anywhere especially since I’m close with 1! They would all hang out together and wouldn’t invite me. I finally mentioned something and We all went to the beach yesterday however the water was super cold so I said to 1&2 can you guys hang tomorrow? They both said “idk I don’t Think so” and I don’t think I can... of course I was on Snapchat watching stories ... ALL of them are together again AT THE POOL, I slid up on one of the girls stories (1) and I said “oop” and she left me on open. Like they said they probably couldn’t hang out... also when we were making plans to go to the beach (2 & 1) was like begging me to invite her twin sister because it would be “rude” if I didint. So is it not rude that none of them thought to invite me? Should I text (1) and tell her I’m kinda disappointed because I asked if she could hang out and she said probably not. when they are nice, I really like them but at time she like this I dislike them. They are still together right now

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