Why was anne Boleyn excecuted?

Anne Boleyn was executed because Henry VIII didn't love her anymore, and he wanted to marry Jane Seymour. Anne had failed to give him a son, and Jane could. Anne had sensed that she was doomed because she failed to give Henry a son, but she didn't know how Henry would get rid of her - allegedly she originally thought that Henry would divorce her and send her to a nunnery. In reality, she was accused of adultery with five men including her brother (incest) and treason and she was beheaded on May 19th 1536.