Dunham was in a five-year relationship with Jack Antonoff, which ended in December 2017.
Miley Cyrus, 28, was first romantically linked to Simpson in October 2019.
The ex-couple share three children together- daughter Aspen, 4, and 2-year-old twin sons, Hayes and Hart.
Amid the accident, the couple has been hounded with a video of her husband allegedly cheating on her.
Bravo’s Real Housewives of Dallas star Brandi Redmond has shared both her grief and gratitude after a car crash that killed her mother in law Jill Marie Redmond
Other cast members have also not been asked to come back on the reprised show.