Was I wrong?

My boyfriend has family over. She’s a cousin, not by blood, and she’s an adult. I’ve been at his house all week and she’s came in his bed room but she never stays for a long period of time. We go to bed early too because he has to get fit work early in the morning. Well I go home today and she literally stays in the room in his bed all night ( on top of the covers so he say). I told him that was inappropriate and she needs to leave it was like 11 at night. We didn’t argue about it but he said he didn’t realize it was an issue. Was I wrong for saying something.

Ps. He also told me she’s tried to make pass at him in the past.

Update:

So there’s other people in this house as well.

He calls me while he’s at work and tells me that someone called,who lives in the house, thinking I was there and said their was someone in his room....it was her 😒. I’m trying to be nice and not stress myself out because I’m too pregnant for this crap. He did tell the person to tell her to leave. I know nothing happens because I was on the phone with him the whole time while she was in there. I just didn’t find it appropriate. He said he thought it was weird too but he didn’t know what to say to her (😑) I just don’t want this to be a developing problem that’s all.