It is usually assumed that everybody got married. Before the rise of Christianity that was simply not true. Only Royalty, Nobility,and the very rich, actually got married in the true sense of "marriage". Marriage was to join two families together. To increase land ownership, or to create an Heir to a throne. Ordinary people, the "peasantry", did not marry in that sense. With friends and relatives as witnesses, the couple vowed to live together, and raise a family.
They performed a "ceremony". They would hold hands and jump together over a small fire; to signify the "warmth of their love, and the warmth of the home."
Still holding hands they would jump over a broom laid on the ground, to signify the household they would share.
That was the start of the Hand Fasting ceremony of today.
Even today, here in Yorkshire, an unmarried couple living together are known to be "Living over the brush".
I have watched a few Hand Fasting ceremonies; and they are just as beautiful as any church wedding.