Is she your bestfriend now?
well, first see if its okay like use a different excuse like "Hey -whatever her name is- what if someone liked your ex and you were friends like would it be bad to date him? Or would you be offended?" And if she asks why then say, "Just because, what if it happened to me? Y'know" and if she says okay and tells you what she think then yes sure but I stole someones man before-she was a friends of mine-