https://english.webdunia.com/article/hinduism-gods-goddess/did-rama-really-disown-sita-116082600007_1.html
https://hinduism.stackexchange.com/questions/20933/is-the-uttara-kanda-of-the-srimad-valmiki-ramayana-interpolated
Please see this, people are divided on this one, but i think evidence is...