How will the marriage and love life of boy born in June 20 1991 and girl Oct 20 1989 be?

A Metal Goat man and an Earth Snake woman would make the worst couple, according to the compatibility chart on this page if you click on Love compatibility.
As the order of yearly elements goes, because Metal benefits from Earth, he stands to benefit from her, although their relationship doesn’t stand a chance to last at all.
Each of them is advised to search for a more compatible partner, as the world is full of people and they are not Adam and Eve. Good luck to both of them.