Depends on relation man. Mere aik class fellow ki gf bhi flirty thi, mujh pe bhi flirt Kiya tha, even disco mein to hamare aik or class fellow ki goad mein bethi hui thi. Lekin bas flirt he karti thi chudti sirf us se he thi. Woh larka bhi open minded tha usay Farak nahi party tha, kyunke usay trust tha.
But its your choice as well, if you don't like it tell her like dynamic2 said above.