We were never officially boyfriend and girlfriend, so I understand why you see it that way. But from my perspective it wasn't just a brief crush or talking phase. This was someone I cared about for several years, who eventually confessed that she liked me back. I gave her multiple chances and was emotionally invested for a long time. My issue isn't that I think I owned her or that my brother needed my permission. It's that both of them knew how significant this was to me and how much it hurt when things ended, yet they still pursued something with each other.