The CW have released the official synopsis for episode 16 of ‘Arrow’ Season 4, titled “Broken Hearts”

Official Synopsis:

“Broken Hearts” — (8:00-9:00 p.m. ET) (TV-14, LV) (HDTV) 

CUPID RETURNS TO WREAK HAVOC ON STAR CITY – A heartbroken Cupid (guest star Amy Gumenick) returns to Star City with one goal – to destroy anyone in love. The team learns she’s killing couples on their wedding day so Oliver (Stephen Amell) and Felicity (Emily Bett Rickards) decide to pose as bait. John Showalter directed the episode written by Rebecca Bellotto & Nolan Dunbar (AR416). Original airdate 3/23/16.