Henry VIII wanted to divorce Catherine because he had fallen in
love with Anne Boleyn.
Catherine of Aragon - First wife of Henry VIII:
The Spanish princess, who had previously been married to Henry's
brother Arthur, Catherine of Aragon (1485 - 1536), was unable to
provide Henry VIII (1491 - 1547) with a male heir; which he
desperately wanted, despite six pregnancies and only one living
daughter (Mary). After Henry became enamoured of Anne Boleyn, he
decided to divorce Catherine in 1533 and eventually had their
marriage annulled. Her health went into decline and she died on 7
after 4 or 5 miscarriages and the birth of a daughter, Catherine of Aragon injured herself giving birth. Henry could tell she wasn't able to bore him a son, so he pretty much tore apart the country trying to find someone who could.