In Surah al-Baqarah, 236-237 :
"There is no sin on you if you divorce women when you have not yet touched them nor fixed for them an amount. So, give them benefit, a
rich man according to his means and a poor one according to his means
— a benefit in the recognized manner, an obligation on the virtuous.
And if you divorce them before you have touched them, while you have
already fixed for them an amount, then there is one half of what you
have fixed, unless they (the women) forgive, or forgives the one in
whose hand lies the marriage tie. And it is closer to Taqwa that you
forgive. And do not forget being graceful to one another. Surely,
Allah is watchful of what you do."*
As per this ayah, if your marriage has not been consummated, then you will have to pay 50% of the dower amount that was fixed at the time of nikkah. If your wife doesn't want the dower amount then she can forgive it and you are not liable for it anymore.
And Allah SBT knows best.