But I have only been loyal to you... I have only ever been loyal to you.... Please, Rama, believe me!
I cannot take you back Sita. You have lived in another man's house and I cannot trust you. I am sorry.
This ought to show Rama something about loyalty...
With Ravana's death, Sita was set free. She was so relieved to return to her husband, she missed the solemn expression on his face.
Are you Agni? The fire god?
When she discovered, he would not take her home, Sita felt destroyed inside. She had only thought of Rama during her captivity, but had no way of proving her loyalty.
Your wife is pure. She has only ever been touched by your soul. She's never defied you, Rama.
Nonetheless, Sita was desperate for her love. She decided to summon Agni, the fire god, who could prove her purity to Rama. She built a funeral pyre, set it aflame, encircled it thrice, and then stepped inside.
And they lived happily, ever after...
No harm came to Sita inside the fire. She encountered Agni, who immediately recognized her purity and protected it.
Agni informed Rama of Sita's actions and confessed that she was indeed virtuous. Rama was deeply moved and proud (as he had never truly doubted her). He happily re-instilled her as Queen of Adodya.
The couple lived in peace with their family and friends for many years, ruling the Kingdom of Adoyda and bringing happiness and order to their people.