It was an engagement to marry
He was engaged to Belle but Belle saw Scrooges love of money talking over and "released him" from his promise. He did not marry after that
Ebenezer
Mr Fezziwig
Scrooge's first name is Ebenezer.
Jacob Marley
Scrooge never married. He was once engaged to Belle but she released him of his promise as another idle, a golden one had taken Scrooges heart (money)
It was Belle
Bob Cratchit
Ebenezer Scrooges
Because Belle realises that Scrooges only love has turn to money (a Gold idle). She confronts him with "would you seek me out of I were poor?". Scrooge doesn't answer confirming that he would not have.
Belle
In Charles Dicken's A Christmas Carol, Belle and Scrooge were engaged as a young couple. Later Belle breaks off their engagement because she feels Scrooge's growing greed is changing him. When the ghost of Christmas Past reveals Belle to Scrooge and a grown woman with a family he realizes what he has lost.