Friendship with my hg

Idk if it's weird but I have this girl best friend like my bestie and I have HHella weird relationship with her cuz we been through so much together and I treat her like sister and girlfriend at once like she is even above those two examples AND I DID HER SO WRONG IN THE PAST and I still have no idea how we are hg after everything I done. Also I feel like we two are too close to each other like we cross oures boundaries 

NO IDEA IF ITS NORMAL PLS HELP