When we talk about love, we must recognise that love is endless, and the love story of the Prophet Muhammad (saw) with Siti Khadijah, Radhiallahu ‘anha, is always an impressive to read. The Prophet Muhammad never stopped loving Khadijah, and although he married several more wives after Siti Khadijah passed away in later years and loved them all, it is clear that Khadijah always had a special place in his heart. Once Aisha, (the Prophet's beloved wife) asked him if Khadijah had been the only woman worthy of his love. The Prophet Muhammad replied:

“She believed in me when no one else did; she accepted Islam when people rejected me; and she helped and comforted me when there was no one else to lend me a helping hand.”

The Prophet always mentioned the name of Khadijah and the favoured friends of Khadijah, until Khadijah died. This is the story of Khadijah, the Prophet’s true love. It is a shining example of what an ideal marriage is.

Reference:
https://www.amuslima.com/the-beauty-of-love-and-dating-an-islamic-perspective/