AITA for refusing to let my sister stay at my house after she ruined my relationship with my boyfriend?

I (29F) have a sister, Hannah (25F), who’s always been very close to me. We grew up together, shared everything, and despite our occasional squabbles, we were pretty much inseparable. We went through high school, college, and all the ups and downs of life together. That was, until she started causing trouble in my relationship.

I’ve been dating Chris (31M) for about two years. He’s kind, intelligent, and we have a great dynamic. We’ve had our issues like any couple, but we work through them. Chris and I are very open with each other, and we’re serious about our relationship. We even started talking about moving in together.

Now, to give you some context, Hannah has never really liked Chris. At first, I thought it was just a sisterly thing—maybe she thought he wasn’t “good enough” for me or was just protective. She would make comments here and there about how “he’s not as fun as the guys she dates” or “he’s a little too serious for you.” It was annoying, but I brushed it off. I thought, She’s just being a sister, being protective.

But it didn’t stop there.

Over time, it became clear that her animosity toward Chris wasn’t just harmless remarks. She started getting more passive-aggressive. She’d make snide remarks about how I was “changing” and how “I wasn’t the same person” when I was with him. She even started criticizing the way he treated me, calling him “controlling” and “overbearing” for things like checking in with me when I was out late. I tried to explain that it wasn’t controlling, just that he cared, but she didn’t want to hear it.

Then came the breaking point.

Last month, Chris and I had planned a weekend getaway. We had booked a cabin by the lake, something simple, just to get away from the stress of work and enjoy each other’s company. I was looking forward to it. The night before we were supposed to leave, Hannah came to me and asked if she could stay at my apartment for the weekend because her roommates were throwing a party, and she didn’t want to deal with the noise. I agreed without hesitation, even though Chris and I had already planned to leave early the next morning. But I didn’t think it would be a big deal—Hannah was family, after all.

When we returned home on Sunday evening, I found out that Hannah had completely gone through my things. And I mean, everything. She went into my closet and tried on my clothes, snooped through my personal items, and even went into my jewelry box. But the worst part? She had been texting Chris while I was away—constantly. I knew because when I checked my phone, I saw that she had sent him several messages and even tried to call him.

I was furious. I confronted her, and she didn’t even seem sorry. Instead, she laughed it off, saying, “What’s the big deal? I was just trying to get to know him better.” I told her that she had crossed a line and that I felt deeply betrayed by her actions. But instead of apologizing, she claimed that I was being “overdramatic” and that I was “too sensitive.”

I couldn’t let this slide. I immediately called Chris, and when I told him what had happened, he was equally upset. He told me that he felt uncomfortable with the way Hannah was acting around him. And that’s when it hit me—she had been deliberately trying to undermine our relationship the whole time. She had been constantly texting him, trying to get in his head, and planting seeds of doubt about me. I was disgusted.

The next day, I sat down with her again. I told her that her actions were completely unacceptable, and I needed space from her. I explained that I didn’t want her staying at my apartment anymore, at least not for a while. I told her that I didn’t trust her, and I didn’t feel like I could have her in my life if she kept disrespecting me and my relationship. She was furious. She accused me of “choosing Chris over family” and said I was being “immature” for not understanding why she was trying to “protect me from making a mistake.”

It’s been a few weeks now, and we haven’t spoken. My parents think I’m being harsh and that I should just forgive her. They say I’m overreacting and that family should always come first, no matter what. But my boyfriend, Chris, has been incredibly supportive of me, and he thinks I made the right decision. He’s even told me that he feels more comfortable not having her around after everything that happened.

So, AITA for refusing to let my sister stay at my house after she completely disrespected me and tried to sabotage my relationship?