َQ:

My Question is that my fiance passed away days before we were about to get married and now is it permissible for me to visit her grave or not ?

A:

You are allowed to visit her grave and pray for her. The fact you were not married should not stop you from visiting her grave even as you may visit any other person’s grave.

There are two benefits to visiting graves: 1. It helps us to pray for the deceased. 2. It reminds us of our final destination.

So, there is nothing wrong if you want to visit your ex-fiance and offer prayers. You may choose to read the Fatihah and ask Allah to shower her with His mercies.

Almighty Allah knows best.