I'm just a seventh wheel,not a paladin

He said he was mine. So what changed? I caught him staring at my friend. Who is like a sister to me. I hid behind something so they wouldn't see me. My heart broke. I'm not good enough. I see his ways with other woman. The way he flirts with them like I'm not there. Soon he will learn. I want to hate him for it but I can't. I'm helpless for him. And always will be. This is a story of a girl who fell for someone dear to her. But once that person joined the blade. She didn't know what to think of him. She fell for the leader but broke her heart looking at the princess lovingly. She fell in love with the one of the enemies, who is her friend.