u/Forward-Relative6106

I’m pretty much done with my bf now, don’t know why am I even writing about this but I guess for my own understanding to process and close this better.
So, this all started when I first visited my boyfriend’s (M32) parent’s house and his sister (W27) was there alone, and the sister threw a massive hissy because I stayed the night there. I left and did not spend the night then. I did not think much of it then, but it was a little weird, especially when the sister brought her boyfriend there all the time and when the brother (my bf) brought a girlfriend, she seemed to have a huge problem with it.
Their dad had a talk with the sister, and several months passed by, and I didn’t want to visit them anymore but later I did. And every time my bf and I were around his sister, my bf acted differently, very distant from me and kind of like undervaluing me. When it was two of us, he was completely different. But around his sister, he acted like “the sister is the girlfriend”. He tickled her belly one time, and on dinner tables my bf acts like he doesn’t know me when his sister is around. Today, he called his sister the name he usually calls me (a little X) and gave me a weird look. And on dinner table, he loudly said how he’d like to date some other types of women later in life - making sure his sister hears that “he doesn’t like me that much”. I talked with him today, and all he said to me “I seem to have an issue with you when I’m around my sister”. That’s pretty much all I needed to hear. Don’t know what that means exactly but to me it sounds like his sister is his number one, and he meant I’m air to him when the sister is around. Hes a completely different man when he’s not around her. Well, I’m not dating a boy who can’t individuate from his sister or who doesn’t like me enough. We live together btw. And weirdly, just yesterday at our place he was so nice and caring and in love with me. And today when we visited his sister, everything changed again. I’m over it. What do you guys think about all this?
Also, I should mention that the sister does not have a problem with me when it’s me and her alone. We’ve actually done things together just me and her, and been nice to each other (after the rough start). She has openly said that she likes me very much, and apologized her emotional outburst at the beginning. But now it’s the boyfriend who acts weird when it’s me, him, and the sister, and it continues.