AITA for telling my sister I didn’t want her to attend my wedding after finding out she was still in love with my fiancé?

I (28F) have a younger sister, Lily (24F), who I’ve always been close with. Growing up, we were best friends, and though we had our sibling disagreements, we had each other’s backs no matter what. When I got engaged to Josh (30M), I couldn’t have been happier. He was everything I had ever wanted—kind, successful, funny, and loving. He made me feel like I was his entire world, and everything seemed perfect.

Lily and I were excited to celebrate my wedding, and she was going to be my maid of honor. But over the past few months leading up to the wedding, I started noticing some things that felt a little... off.

At first, I thought it was just me being paranoid. I had a lot on my plate with wedding planning, work, and everything else, but I couldn’t ignore the nagging feeling in the back of my mind. It started with small things—Josh and Lily would spend a little too much time talking when they thought I wasn’t paying attention. There was always this energy between them that I couldn’t quite place.

One night, I was going through some photos on my phone, looking for something to share for the wedding invite when I accidentally clicked on a picture of Josh and Lily. They were at a family gathering, and in the picture, they were standing close to each other, laughing, but what caught my eye was the look on Josh’s face. I had never seen him look at me that way. The same way he looked at me when we first started dating—like he was in love.

It made my stomach drop.

I brushed it off, telling myself I was being paranoid. But the feeling only grew stronger the closer we got to the wedding. At my bridal shower, I overheard a conversation between Lily and one of my cousins. Lily was talking about how amazing Josh was and how lucky I was to have him. But there was something in her voice, something wistful, that caught my attention. It wasn’t the tone of someone who was just happy for their sister. It was the tone of someone who wished they had the same thing.

I couldn’t ignore it anymore. After the shower, I pulled Lily aside and asked her what was going on. At first, she denied everything, saying she was just happy for me. But I pressed her, telling her that I felt like there was something she wasn’t telling me. After some hesitation, she finally confessed.

“I’m still in love with him,” she admitted, tears in her eyes. “I’ve always been in love with him, and I thought I could handle seeing you two together, but I can’t. I never meant for it to happen, but my feelings haven’t gone away.”

I was shocked. My sister—my best friend—had been hiding this from me all along. She had been harboring feelings for Josh even before I met him, and she never told me. I didn’t know what to feel. Part of me felt sorry for her—love is complicated, and I understand how hard it can be to see someone you care about with someone else. But the other part of me was furious. Furious that she had allowed her feelings to fester and grow, that she had been hiding them from me while I was preparing to marry the man I thought I knew.

I told her that I didn’t want her to attend the wedding. I told her that I couldn’t have her there, knowing how she felt about Josh. It felt like a betrayal. I said she needed to figure out her feelings before she could be a part of my life in this way.

Lily was devastated. She begged me to reconsider, saying she would get over it, but I stood firm. I couldn’t allow my sister to be in my wedding while secretly in love with my fiancé. It wasn’t fair to me, to Josh, or even to her. She needed time to heal and let go of her feelings before she could be around us without any underlying tension.

Since then, Lily has been cold toward me. Our family is divided. Some family members agree with me, saying I did the right thing by confronting the issue head-on, while others think I should have been more understanding and allowed her to be part of the wedding. Some have even accused me of being too harsh on Lily, especially since she admitted she would try to get over her feelings.

I love my sister, and this decision isn’t easy for me. But I know that if I let her attend the wedding, it would always feel like something was off. I don’t want that kind of energy on my special day.

Now I’m left wondering: AITA for telling my sister that she couldn’t come to my wedding after finding out she was still in love with my fiancé?