Greeks lost. Read a book too.
Perhaps you should read a few. Persia has a habit of winning battles and losing wars.
After getting their butt kicked at Salamis and Plataea, the Persians would never again be a serious threat to most of the Greek city-states. In time, the Persian Empire would be defeated by a gay Macedonian-Greek prince, his tutor, and a handful of mercenaries.
Oh, yeah - forgot to mention that Xerxes’ father Darius got his butt kicked by the Greeks, too. Darius’ attempt to conquer the Peloponnese ended rather abruptly at Marathon in 490BC.
Perhaps you’ve heard of it?