In the words of the song, love is a many-splendored thing. It can bring joy and happiness, move mountains, and banish sorrow and despondency.
On the other hand, love also has a dark side, a very dark side indeed. It can make people do things they ought not to do; it makes them sick, torments their souls; and, as we discover in Lorca's Blood Wedding, it exerts a deadly power over people that can create conflict, leading to violence, bloodshed, and death.
When love takes hold, its power can be so irresistible that it can overwhelm our reasoning faculties no matter how well-developed they may be. In the story, we can see an illustration of this in the figure of the Bride. She has resolved that she will tell Leonardo, the man she truly loves, to keep away from her wedding to the Bridegroom. She also tries to hurry proceedings along in the belief that this will diminish her feelings for Leonardo.
But her feelings for him are so powerful that no amount of rational planning can possibly hold back the inferno of passion that rages deep within her soul. In the event, the Bride marries the Bridegroom but still elopes with Leonardo. The love between them is just too strong.
Sadly, there is to be no happy ending in all of this. Urged on by the allegorical figure of Death, the Bridegroom hunts down his wife and her lover and kills Leonardo in a fight in which the Bridegroom is also killed.
Both men loved the Bride and both died out of love for her. In that sense, one could say that love has won the day but not in the way we'd normally expect to see it triumph.