Ares was jealous primarily because of Aphrodite's affections for Adonis.
While Ares, the Greek god of war, engaged in various affairs and relationships, one significant cause for his jealousy stemmed from Aphrodite's love for Adonis. The reference highlights that Ares, upon discovering Aphrodite's deep affection for the mortal Adonis, took the form of a wild boar and killed him. This act of violence was fueled by Ares's envy and possessiveness, showcasing the destructive consequences of his jealousy. Therefore, Adonis served as a key figure in instigating Ares's jealous rage.
