After ONS revealation Bani had washed away her Sindoor breaking relationship with JW. Today she accepted him back as her husband by proclaiming her love for him. They are in real sense ready to move forward & promise to stay together. They don't have any doubts about each others feeling & trust each other once again. Remarraige signifies that.
Hopefully it means that Bani should start wearing Mangalsutra & sindhoor again. She didn't put it next day thoughđ.