Final answer:
Venus was angry because Psyche, by her captivating beauty, caused Venus' temples to be neglected as Psyche received the adoration meant for Venus, leading to jealousy and a series of actions against Psyche.
Step-by-step explanation:
In Apuleius' "Cupid and Psyche", Venus was angry because Psyche, a mortal woman, had captivated the hearts of men to such an extent that Venus' temples were neglected. Deeply jealous and upset by the loss of attention and adoration towards her, Venus sent her son Cupid to make Psyche fall in love with a monster.
However, Cupid himself fell in love with Psyche, leading to a series of events that further fueled Venus' wrath against her.