One of the things I’ve learned over the years is that the people in your heart will make you cry—that’s just the way the waterworks work. But nothing approached the way I cried when Rob died.

In Josh Ruben’s “Heart Eyes,” Ally (Olivia Holt) works in advertising for a high-end jewelry brand. Her latest campaign pitch on doomed lovers (Romeo and Juliet, Bonnie and Clyde, Jack and Rose, etc.) ...