Why should Prophet Mohammed (swa)'s marriage to Khadija (ra) be considered as the prototype?

that was an ideal marriage ...if a lady from high ranking family ...and had wealth ...she is normally outspoken rether arrogance is her right ...but holy hkatija had displayed best of manners ...caring to husband giving him all the pysical and moral strength ....wealthiest lady died of starvation ..what a scrifice for islam ....salutes to her ....