No i dont agree. She may see you as just a friend rigbt now but an emotional connection has developed which means she could also be in denial about her feelings and lying to herself that you are just friends
but the reality is that even the bestest friends dont treat each other this way. They dont wana buy each other jewlerry or go for a meal alone together or spend hours talking on the phone etc.. Im guessing you dont do any of that with your male friends?
Its time to back away OP. Deep down you no this is wrong and you also no if you had a gf you wouldnt like her having a best friend like you.