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When two people involved with each other, official or not, built up their relationship over time. Full of real raw passion, it is not to be interfered. It shouldn't be hidden like shame or embarrassment. And become poly, show her she means a lot to you as she say she does.
She her she is still loved. Wanted. Needed as before anyone came into the picture. Show her that her real love for you means the world to you as you say it has. Show her that her role in your life and in this poly relationship is still vital.
If she's unlike anybody as you say then show her off with pride. Make her feel like you are proud to own her. Make it known to her you pay attention to her and her feelings in all of this. Make her feel like she is yours even when it's not official.
She her she's worth it to you. Show her that her love for you doesn't go unnoticed and won't ever go unnoticed. And lay down the lines to others that what you and her have is real and vitally important to be cherished and treasured and not to be touched.
Show her that no matter what it's you and her against the world. Show her that....give her that.....and she will continue to love you like you want her to... because she's yours..she's been yours since day one....both of you know it
