I recently broke up with my partner of 10+ years. Despite breaking up and telling him to move out he's still here quite often, he showers here, eats here and has said that he needs to sleep in the sofa until he sorts out accommodation.
My little sister has been staying with me over the summer until she goes back to uni. I obviously told her about our breakup but nothing more. The other day he asked me if I had told her that we had broken up, I said yes. He said he found it weird that she was staying up late considering he needed to sleep in the sofa and asked whether she was doing it on purpose so he couldn't sleep there because I told him I didn't want him staying in the house. I told him that she wasn't and didn't know anything about him staying in the sofa or me wanting him out because she didn't.
My sister found out today and was annoyed at me for telling him. She said it makes it awkward for her whilst he's still around the house and she's here for another 2 weeks until she goes back to uni.She said I should have lied to keep her out of it but I don't think I should have. She thinks I should have lied and said I didn't tell her to keep her from being involved and avoid any awkwardness. I don't think I should have lied and that there's no reason for it to be awkward. Am I being unreasonable for thinking she's overreacting?