Start with high-confidence love poetry books, then narrow by subgenre or adjacent topics.
The Days Run Away Like Wild Horses
Charles Bukowski
Mockingbird Wish Me Luck
You Get So Alone at Times That It Just Makes Sense
Dirty Pretty Things
Michael Faudet
Love Her Wild
Atticus
A Lover's Complaint
William Shakespeare
Love Three
Aaron Kunin
Violet Bent Backwards Over the Grass
Lana Del Rey