Two people and the number of their bond. The reading compares your Life Path and Soul Urge numbers with the other person's, and adds them up into a Bond Number. It shows where you complement each other and where you need attention. It describes tendencies, not a verdict on the relationship.
Your Life Path, with your Soul Urge as a complement. What you bring to the relationship.
Their Life Path, with their Soul Urge as a complement. Based only on their numbers, with no guessing at their feelings.
The sum of both Life Paths. The character of what you build together.