So Ares, eager to marry Aphrodite went to find Hephaestus, determined to take him up to Mount Olympus by force
But Hephaestus drove him back by showering him with hot metal
Dionysos was the next god to vist Hephaestus, but instead of taking him to Mount Olympus, he suggested that Hephaestus just goes up there himself to free Hera, so Hephaestus could take Aphrodite as his wife. Hephaestus thought that this was a very good idea
So Hephaestus returned to Mount Olympus with Dionysos
Hephaestus freed Hera from her cursed chair
Hephaestus and Aphrodite married, much to the anger of the young goddess. This is why Aphrodite married Hephaestus!