How do I deal with a manipulative sister?

For context, I have an older sister (27) in a family of 7 siblings. It’s all pretty complicated, we all have different dads and experienced traumatic childhoods. My older sister likes to be in control and she’s the rescuer type who likes to protect everyone. I’m younger than her (24) and we have two younger siblings too. My little sister (21) and my bf (24) had some kind of drunk conflict 3 years ago when me and my bf had just broken up. Neither of them remember what happened and my little sister says she doesn’t think it was my bf who upset her but isn’t sure. My bf and I have just gotten back together and are extremely happy, he’s the love of my life and always has been. My older sister doesn’t like him and talks really badly about him. She says things like ‘has he moved out of his parents yet?’ (He pays rent for a house in front of his parents so he can help his disabled brother and mentally struggling sister, and be close to them), she is always bringing up that he was rude to her when we last dated because he didn’t talk to her enough but he never said a bad word he struggles a little socially sometimes and she can be super intimidating. The other day she told me that my bf needs to apologise to my younger sister for that conflict from years ago if he wants to be apart of the family again. She was very intense and when I tried to explain that he is a kind guy, she accused me of calling our younger sister a liar. I cried during the conversation because it made me feel like a bad sister. I felt jaded and anxious after the conversation. I don’t know how to approach her now and whether I want her to be around my bf. I called my little sister and double checked that she was comfortable to be around my bf and she was happy about it and happy for me. What do I do?