How did king Henry VIII get caught cheating on his wifes?

Anne Boleyn was the second wife.

we can only answer this question if we now WHAT Henry and WHAT wife.

Henry VIIIs last wife was Catherine Parr

Henry VIII had only one wife at any one time but he had 6 during his life.

Catherine of Aragon. Catherine of Aragon Henry VIII's first wife was Catherine of Aragon.