Not to belabor the point but I think you want to come across as in control, focused and in some respects apathetic - it could go either way and you're fine with either. Remember the opposite of love isn't hate - its apathy.
She will feel your absence much stronger than she'll feel a negative presence. You also don't appear pursuing and you don't give her a reason to continue to be resentful.
Don't do anything to hurt, don't do anything to help. Live your life as if she didn't even exist.
She's a friend who betrayed you horribly, and continues to take advantage of you if you allow it. Treat her as such.
