Every house faces a partner across the chart, and the most famous pair is the 1-7 axis: self and other.
The mirror
Whatever sits in or shapes your 1st house quietly describes who you draw into the 7th. The self you project sets the partner you attract. A bold 1st pulls a stabilising 7th; a soft 1st pulls a defining one. The houses are in dialogue whether the 7th is loaded or empty.
The other axes speak too: 2-8 (your money and shared money), 3-9 (small thoughts and big beliefs), 4-10 (private base and public role), 5-11 (what you create and what returns), 6-12 (work and rest).
Read a house alone and you only hear half a conversation.
Relationship questions get clearer the moment you read the axis instead of the single house.