Pulp Fiction wasn't directed by Ben Stiller. Quentin Tarantino was the creative force behind it. Tarantino's unique style and storytelling made the movie a classic. Ben Stiller is known for a different kind of filmmaking.
There is no direct connection between Ben Stiller and Pulp Fiction. Ben Stiller is known for his own brand of comedic acting in movies like Zoolander, Meet the Parents etc. Pulp Fiction is a Quentin Tarantino classic with a very different style, cast and narrative.
No. Quentin Tarantino is a director with a very specific and recognizable style in his movies, and he directs his own works. Ben Stiller also has his own directorial career which doesn't involve directing Quentin Tarantino's movies.
Well, 'ben stiller super sad true love story' could be about Ben Stiller's character going through a heart - breaking journey in love. Maybe he falls for someone who is unavailable or they face insurmountable obstacles in their relationship. It could also show how he copes with the sadness and the end of this true love.