Answer :
In Greek mythology the figure that is known as the Queen of the Olympians thanks to her poisition as the official wife of Zeus is Hera (Juno in Roman Mythology). Hera is the goddess of marriage and the family, remaining faithful to Zeus even though he never remained faithful to her. She is probably most famous then for her jealousy and vengeful nature resulting from Zeus's common infidelity.
The answer is:
Hera or Juno
Just a quick reminder, Hera and Juno are the same person. They have different names because one is Greek and one is Roman.
In this case, since you are using "Zeus", we would say "Hera" and not "Juno".
Although Hera was the queen and married to Zeus, her husband wasn't so faithful and would often go out to have affairs with mortals, nymphs, and immortals.