Hello Raven
Goodness me ~ you seem to choose so many very challenging relationships!
Over the past few years you have had crushes on a number of people whom you have told us about.
This is normal for teenagers.
Now you mention being 'bi-curious' ~ something else which many teenagers go through.
This friend seems to know what she is ~ and possibly knows that you may not really know what you are ~ and that you may not be the right person for her to have a relationship with.
It's not surprising, though, in the circumstances, that she flirts with you, but be careful not to get involved in anything that you may later regret.