My boyfriends sister is clingy, it's gotten worse during covid. What do I do?

Anonymous
My boyfriend and I are in a relationship of 6 years. We are currently living with his parents and his sister. His sister started becoming close to me during the third year of our relationship and I always encouraged her to come to us if she needed advice. A year an a half ago (during the beginning of covid), she started to come down and share meals with us. Eventually things got weird... she would always want to go anywhere we went, be upset if we got food/went on a date without her, she wouldn't go anywhere unless we went with her, cut off all her friends, gets upset or lonely when we see our friends, goes through our mail and our phones, stay in our room from 8pm till 1 am. When we told her we wanted space and distanced ourselves, she got a dog. And then told us the dog likes our room, so then the same pattern has started again. Our relationship has strained because of this, we aren't intimate anymore because (how can I, when his sister is laying on our bed). We don't even talk much anymore because his sister repeats everything we say to his other siblings. I don't know what to do? I've voiced this to him so many times. He said it's because she thinks we are bestfriends. She won't even leave the room when I change my clothes 😭😭😭 I don't even talk to her when she's laying on our bed anymore and she still just lays there 😔 I don't know what to do, even when we don't open the door she stands outside calling our names until we do.
My boyfriends sister is clingy, it's gotten worse during covid. What do I do?
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