and? that still doesn't give her the right to carry on an emotional affair behind the fiance's back. which is basically what this is, honestly, and it's not going to end well for anyone involved if she finds out.

so yeah my sympathy well is pretty dry for OP, "mixed signals" or no. if you really care about your friend so much then don't fuck up her life by doing this. let her decide on her own what she wants to do or not do and stay out of it.