5. She only sees you as a “brother”.
Much like in #4, she’s deescalating here. She’s trying to deflate your dream balloon of being with her and bring you down to reality. That reality is that the only relationship you’ll have with her is as friends. It’s time to accept that.
6. She already has a man in her life.
She may actually have a boyfriend. She may just be saying it to get you to stop pursuing her. Either way, she just slammed the door on any possibility of there being a romantic relationship between you and her.