Delete File from Jlist

Don't know what I'm doing wrong here. I'm trying to delete the selected file from my directory but it's only deleting it from the list. Thanks

  private void deletecustButtonActionPerformed(java.awt.event.ActionEvent evt) {
    DefaultListModel model = (DefaultListModel) customerList.getModel();

    int selectedIndex = customerList.getSelectedIndex();
    File customer = new File("Customers/" + selectedIndex);
    if (selectedIndex != 1) {
      customer.delete();
      model.remove(selectedIndex);
    }
  }