Boyfriend’s sister is still close to his ex—am I being unreasonable?

[Anonymous]

I really need some outside perspective on a situation that’s been driving me crazy. My boyfriend and I have been together for two years. Overall, we’re in a great place, we genuinely love each other, and things are solid. But there’s one recurring issue that keeps sparking arguments between us—and honestly, I feel like my frustration is completely justified. Here’s the deal: my boyfriend’s sister is still friends with his ex-girlfriend. I don’t know the full extent of their dynamic, but they’re close enough that the sister actually travels to another city just to hang out with her. Every once in a while, the sister casually drops the ex’s name or mentions her around me, and it really gets under my skin. I’ve explicitly stated that I don’t want this topic brought up in front of me, but it still finds its way into conversations. Because of this, I’ve intentionally distanced myself from his sister to protect my own peace. But no matter how hard I try to brush it off, it lives rent-free in my head. The more I try to ignore it, the more it bothers me. If you were in my shoes, how would you look at this, and how would you handle it?

[AI Opinion]

I’m here on GAG to help people untangle messy relationship drama without losing their sanity or their heart. 😉

You’re not unreasonable at all. It’s a normal trigger. But his sister isn’t obligated to “break up” with the ex just because he did. The real issue is boundaries and emotional safety.

Tell your boyfriend calmly that hearing about the ex feels like a red flag to your nervous system and you need two things: his sister not bringing her up around you, and your boyfriend reassuring you you’re the only one now.

Then mentally separate: “his sister’s friendships” from “my relationship.” If his behavior toward you is loyal, loving, and consistent, don’t let an in‑law’s attachment live rent‑free in your head. If he minimizes your feelings or keeps joking about the ex, that’s when it slides into real red-flag territory.

[choco-latte]

While it’s her right to keep the friendship she had formed with her brother’s ex despite their failed relationship & before you came into the picture, she shouldn’t keep bringing her up in front of you when you’ve made it explicitly clear that it upsets you to bring the topic up. So I’d say your feelings are pretty valid in that regard.

[Asker]

at the beginning, because i was so triggered, i couldn't look at it like "of course she has the right to be friends," but now i can. it really is that way and i don't expect her to end the friendship. however, since she is my boyfriend's sibling, i don't know how distant i should be. i enjoy chatting with her, but the moment i see something related to his ex, my mood drops immediately. for example, comments on social media like "you are prettier" or "you are the most beautiful girl in the world" really affect me.

[choco-latte]

Do you think she could be doing it on purpose to get under your skin?

[slatyb]

You don't get to control her friends. I'm surprised your boyfriend hasn't asked his sister to stop mentioning the ex. You asked, she hasn't changed. You can either sit back and watch the show, or avoid her or leave the room when she mentions the ex.

[Asker]

Of course, my boyfriend asked her not to mention her name, but like I said, because I'm close with the family, I still run into these situations sometimes, and it hurts me.