You do not have any obligations to an ex partner.
Jared is eating lunch when his ex Shelly demands that he keeps his promise go see a movie with her.
Jared wants to avoid upsetting Shelly.
Jared gives Shelly the number of one of his friends who wants to see the movie.
Jared goes to see the movie with Shelly.
Jared spends a nice relaxing night at home free from drama.
People think Jared and Shelly are still dating.