It is not luck that has united this couple, they call it ... The Destiny
Destiny is a word that implies an ending: a destination to one's life. When two people were "destined for each other," they've given in to a notion that the journey is complete. You could say fate brought them together, but that doesn't give the situation a finality that the word destiny does.
Love is our true destiny. We do not find the meaning of life by ourselves alone - we find it with another.
We congratulate this couple and we wish them a lot of happiness and a lot of good vibes!