My (27F) sister (29F) and her husband (31M) had gone on a trip to our home town for some buisness they had to take care of, and they asked me to take care of their appartment and their pets while they were gone; the one thing they asked me not to do is to bring people over. I respected this rule until my bf and his friend were almost kidnaped on the second to last day of their trip. They managed to run away and no harm was done to them, except we were all sttattered and alarmed for the weeks that went by after the fact. During the first night my bf told me he even had a panick attack and I was scared also, because in my sister's appartment there are noises during the night that make it seem as if somebody is inside. Me and my bf were so scatterd that we decided to spent the night together, and I invited him over to my sister's appartment without her knowing. (For the record: my bf and I did not do anything seggsual or anything, we just saw a movie and kept each other's company).

On the next morning, my bf helped me clean up everything, and left the apartment early necause he had to travel to his home town for a medical procedure he had to do, and also to be with his family for a while.

I knew what I did was wrong so that afternoon I called my sister and told her what happend, and explained to her why i did what i did.

When they came back they were mad at me, and I understand that. She told me that I'm behaving like a teenager, she called my bf a coward for going to his home town and leaving me alone, and how could she trust me with her appartment now, because they are going on a trip on a few weeks and they wanted me to take care of the apartment again. She also told me that she dosen't want anyone of my friends to be around her house what so ever. She dosen't even want to talk to my bf at all, not even if he tryes to apollogise or explain himself (I haven't told by bf yet).

I apologised to her for braking her trust, and abusing her hospitallity. I do feel bad for doing that, but I also think my sister and her husband are being a little missjudgmental to my bf and blaming him for things he didn't do. I don't know what to do, I don't want my sister not to trust me, I do want my sister to get along with my bf, but she made it clear that she dosen't like him although they only have seem each other twice and not spoken mutch. Under different circumstances I wouldn't have broken my promise. Any advises?

TL;DR: my sister told me not to have anyone over, but my bf and I were scared to be alone because he was almost kidnapped. I told my sister after the fact, and I apollogise but she's still mad at me (rightfully so), and is not very found of my bf because of that.