I am so relieved to know that i am not the only one who is interested in finding this movie.
I know i saw this movies in Grenada, which is where i'm from. I saw it around the late '60's or early '70. I am almost sure it was Sidney Poitier who played the role of a heart surgeon.
He was in love with a white nurse, she has a bad heart and needed a heart transplant.
There was a black nurse who was in love with him. At the end of the movie the black nurse was killed in a car accident and her heart was donated to the white nurse.
The white nurse sent a hugh bouquet of white roses to her funeral.
It seems like this movie never existed, since i can't find it anywhere.