what does the bible say?
Lilith is a mythological character purported to have been Adam's first wife. The Bible contains no such account nor even hints at such a possibility. According to the legend, Lilith was headstrong and independent, and didn't want to submit to Adam, so she divorced him.
The legend of Lilith originated in the last chapter of the Epic of Gilgamesh—a chapter which was probably not original to the rest of the text. In the story, the goddess Inanna finds a tree in a river and plants it in her garden. She cares for it for ten years, but finds that it's been infested with "the serpent who could not be charmed," "the Anzu-bird," and "the dark maid Lilith." Inanna cannot get rid of the squatters, so she asks her brother Gilgamesh. He strikes the serpent, leading the Anzu-bird to flee with its young and Lilith to smash her home and escape to "the wild, uninhabited places." Gilgamesh chops up the tree and makes a throne and a bed for Inanna.
The only verified part of Lilith is that she was a character in ancient Sumerian/Akkadian folklore. Any "evidence" found in the Bible is easily dismissed. The bulk of literature defining her role in history comes from Kabbalah—a Jewish-based cult. In short, Lilith was a figure of ancient mythology who has since been used to represent death to innocents, sexual predation on men, and feminist independence. She was never real, and she certainly was never married to Adam.