The Prophet ﷺ did not marry any other woman alongside Khadijah until she passed away.
لم يتزوج النبي ﷺ على خديجة حتى ماتت.
Muslim narrated it in Fadail al-Sahabah (77:2436) from Abd bin Humayd, who said, Abdul-Razzaq informed us, Mamar informed us, from Zuhri, from Urwa, from Ayesha, and he related it.On the same subject there is a report from Anas bin Malik, who said, "When something was brought to the Prophet ﷺ, he would say, 'Take it to so-and-so, for she was a close friend of Khadijah.'" This was narrated by Ibn Hibban (7007), Tabarani in al-Kabir (23/12), and Hakim (4/175), all of them through the route of Asad bin Musa, who said, Mubarak bin Fadala told us, from Thabit, from Anas bin Malik, who related it.Mubarak bin Fadala, with a fatha on the fa, is a disputed narrator. Ibn Main said, "There is no harm in him." Nasai said he is daif. Abu Zura and Abu Dawud said, "He engaged heavily in tadlis." He would practice tadlis and level out chains, so a narrator like him must explicitly state that he heard directly, and I did not find that he did so here.