He, sallallaahu ‘alayhi wa sallam, was a good example in maintaining an appreciation for past relationships:

‘Aa’ishah (the wife of the Prophet) said: “I did not feel jealous of any of the wives of the Prophet as much as I did of Khadeejah though I did not see her, but the Prophet used to mention her very often, and whenever he slaughtered a sheep,he would cut its parts and send them to the women friends of Khadeejah. WhenI sometimes said to him: “’As if there is no woman on earth except Khadeejah!’he would say: “Khadeejah was such-and-such [i.e. saying words of praise about her], and from her I had children