Who is Thorkild Bjornvig from Isak Dinesen: The Life of a Storyteller and what is their importance?

Thorkild Bjornvig was an aspiring poet, who had an odd relationship with Dinesen during her later years. He was much younger than Dinesen and extremely attractive. Over time, however, Bjornvig became worried about losing his own identity and rejected her. Dinesen didn't take it well.