One thing I can say is ive been through the same issue before if she doesnt reciprocate her feelings, I would say just keep liking her as a friend ( leding you on is cruel though), and if she talks about the girl to you explain to her like you just confessed, but you still wanna be friends and you dont want to hear about that certain topic. If you draw the line with your boundaries she should follow the rules that you set in the relationship, and if she doesnt then shes undeserving of your time and energy, especially if she wont understnd ur boundaries.