Why was Catherine of aragon divorced?

Catherine of Aragon's marriage was annulled; she did not divorce. The reasons Henry VIII wanted the marriage annulled were due indirectly on the pressures to produce a male heir. He simultaneously, fell in love with Anne Boleyn, after he had start the formal process of requesting the Church annul his marriage to Catherine. Long delays, and the attempts to exert control over England, and her crown by the Roman Catholic Church, resulted in Henry formally breaking from the Roman Catholic Church.

He then appointed the Crown (or King) as Supreme Head of the Church, in England. Thomas Cranmer, the archbishop of Canterbury then granted Henry annulment of his marriage with Catherine of Aragon.