love match

noun1

1. •
   A marriage, betrothal, or other romantic relationship which is based on a spontaneous mutual feeling of love by the two individuals in the relationship, as opposed to a relationship based on other reasons or an arranged marriage brokered by parents or by third parties.

   • My second marriage, unlike my first, in which I became pregnant at 19 and married the man, was a love match from the start. — 2006