Girl says she has boyfriend but flirtacious, What should I do?

I met this girl who does haircuts and i know most girls tend to flirt with their customers anyway but after a few times of meeting her and getting to know her. I asked her out and she tells me that she has a boyfriend and i am like okay and i replied with whoever he is he is very lucky to have you and continued on to still schedule a time to see her as if nothing happend . Next time I see her I have fun with her make fun of her and have a blast and been remembering what she told me so that way i can have conversations with her because generally i would afterwhile not come up with anything to say. Next time i see her she is more flirty with me and was touching me a lot more coming up with nick names for me, more gigily. The last time i saw her she was giving me more compliments and even told me that i was handsome , twice as flirty with me and much more gigily and i mean she was like a completely different person than normal and i figured it must be sign that she is single and wants to go out and i asked her out again but she tells me that she still has a boyfriend after that moved on to schedule a time to get a haircut again as if nothing happened and ended on a laughing comment. and not once in all of our conversations she never mentions her boyfriend and she keeps on letting me get haircuts with her. Now i havent dated a few years so i am a little rusty to know if woman likes you or want to go out with you but i mean i am not stupid with the average girl i have asked out she always got awkward or if she had a boyfriend she would mention him in the conversation to let me know in some way she was with someone. I am really confused is this girl testing me and would i have to call her out on it to tell me the truth? or is she manipulating me and toying with me?