Based on the classical earthly-branch relations of your two zodiac animals — this combination may emphasize these tendencies; real people add the nuance.
A calm, workable middle ground
Rabbit and Horse share no classical affinity or conflict — a neutral pairing. Nothing is pre-written: no built-in magic, but no built-in friction either. The relationship is what the two of you make of it, and many long, happy marriages grew from exactly this quiet start.
Practical shared goals matter more than chemistry here. Build rituals together and the bond compounds year after year.