'A'isha reported that Allah's Apostle (ﷺ) did not marry any other woman till her (Khadija's) death.
Sahih Muslim Book 44, Hadith 111
← Previous Hadith Never did I feel jealous of any wife amongst the wives of Allah's Apostle (ﷺ) as I feel in case of Khadija (though I had never seen her), for he praised her very often.

Sahih Muslim Book 44, Hadith 110 Next Hadith → O Allah, it is Hala, daughter of Khuwailid, and I felt jealous and said: Why do you remember one of those old women of the Quraish with gums red and who is long dead-while Allah has given you a better one in her stead?

Sahih Muslim Book 44, Hadith 112