Her unloyalty lied in the fact that she wanted to rule over Zeus and devised a plan to do so. In order to overthrow Zeus, Hera decided that she would drug Zeus and make him fall asleep. Once asleep, the gods tied Zeus to his throne.
Hera was a jealous wife, and she fought with Zeus frequently over his extramarital affairs and illegitimate children. For this reason, Hera was known for punishing offending husbands. She was the protector of women, presiding over marriages and births. She had three children with Zeus – Hebe, Ares, and Hephaestus.
Unfortunately, Zeus constantly cheats on Hera and he has done it over a hundred times, but in the end Hera always forgives him. But that does not make her angry and mad. This anger then goes to his sons and daughters as she takes her anger out on the children he has with the other mortals and deities.
Zeus proved to be a serial adulterer, as he had many affairs with other gods and mortal women. Hera quickly grew vengeful and envious of these affairs. Since Zeus was so strong, Hera could not take out her anger on him but rather on his lovers.
Hera was understandably jealous of all of her husband's infidelities. The goddess had a violent temper, and Zeus roused her fury more than once with his incessant seductions.
What happens to Zeus after Hera seduces him? He agrees to fight for the Achaeans.
Zeus fell in love with her and, to protect her from the wrath of Hera, changed her into a white heifer. Hera persuaded Zeus to give her the heifer and sent Argus Panoptes (“the All-Seeing”) to watch her. Zeus thereupon sent the god Hermes, who lulled Argus to sleep and killed him.
Before his marriage to Hera, Zeus consorted with a number of the female Titanes (and his sister Demeter). These liaisons are ordered by Hesiod as follows: (1) Metis; (2) Themis; (3) Eurynome; (4) Demeter; (5) Mnemosyne; (6) Leto.
Zeus finally became enamored of the goddess who was to become his permanent wife — Hera.
Hera was courted by her brother Zeus who was the leader of the gods on Mount Olympus. At first she was not interested, but Zeus tricked her into marrying him by disguising himself as a wounded cuckoo bird. Hera rescued the cuckoo bird and ended up marrying Zeus.
To avenge her wounded pride, Hera sets about manipulating the events of the Trojan War. She argues with Zeus on behalf of the Greeks, she conspires to break the truce in order to create more opportunities for Trojans to die, and she seduces and drugs Zeus in order to meddle with the outcome of the war.
Sometime during her marriage, presumably in retaliation, Hera started an on and off affair with Hades that ended around the "80s." It is unknown if Zeus was ever aware of the affair.
Zeus slept around because he thought it was fun. Zeus wanted to have as much offspring as possible.
The God Zeus fell in love with Europa and wanted to take her away from her family to live with him. One day while Europa was wandering amongst her father's herds of cattle she saw a white bull. She was not aware that Zeus had turned himself into the bull in order to trick her.
Io was constantly avoiding his amorous attempts, until Zeus took the form of clouds, surrounded her and made love to her. Unfortunately, his jealous wife, Hera, learned about this relationship and turned Io into a white cow to punish her and stop them from getting involved.
Zeus's notable spouse, Hera, holds a significant role as the goddess of women, marriage, family, and childbirth. Intriguingly, Hera is not only Zeus's wife but also his sister. Their union began with Zeus employing a clever ploy—he transformed into an injured bird to elicit Hera's compassion and affection.
According to a Homeric Hymn, there are three goddesses whom Aphrodite “can't persuade or decieve”, i.e. who don't feel sexual desire and are perpetually virgins. They are Athena, Artemis and Hestia. So, we are sure that Zeus did never have affairs with any of those three.
Zeus was known in his time as much more than the father of the gods. He was also a womanizer, and as such, he fathered many, many offspring! He would transform into various animals to fulfill his desires; therefore, his 'children' are quite interesting.
Accordingly, the Greek god Zeus's affairs were with willing participants – regardless of his trickery and disguise to seduce them. The male-dominated art world interpreted Zeus's promiscuity as part of fulfilling his duty to populate the newly formed world.
Zeus disguised himself as Hades and slept with her, and as a result gave Persephone children. Zeus also didn't want children with Persephone.
In Book XIV of Homer's Iliad, Hypnos is enlisted by Hera to lull Zeus to sleep so that she can aid the Greeks in their war against Troy.
Despite Zeus' wandering eye, Hera remained fiercely loyal to him. While she may have had numerous opportunities to cheat on Zeus, she spent most of her time punishing the objects of his desires.
Io. Zeus fell in love with Io and seduced her. To try to keep Hera from noticing he covered the world with a thick blanket of clouds. This backfired, arousing Hera's suspicions.
Suffice it to say that Zeus was constantly involved in extramarital affairs. Throughout the various and sometimes contradictory myths composed by Greek authors, there are at least 20 divine figures with whom he consorted, and about twice as many mortals. Again, the exact number doesn't matter.