“0, merry hae I been teethin a heckle,
.....
“Bitter in dool, I lickit my winnins
“0' marrying Bess, to gie her a slave.
“Blest be the hour she cool'd in her linens,
“And blythe be the bird that sings on her grave!”
One can understand the disappointment that the poet expressed. My only comment is that it is worth trying to see that it doesn't happen, although of course there is an element of luck in all life's adventures.
Naturally one accepts people as they are. If one falls in love, and if one is lucky enough to avoid all the pitfalls and persuade her to say, “Yes, I will have you”, then one treasures her as the priceless jewel of another person.