In A Christmas Carol how did Scrooge change when his girlfriend left him and how did their relationship change?

The Ghost of Christmas Past shows Ebenezer an encounter with Belle, his former fiancee.  In the memory, Belle breaks off her engagement to Scrooge, citing the fact that love of money has overtaken the love and passion that he previously felt for her.  The scene then cuts to a more recent Christmas, which a now-older Belle is sharing with her husband and family.  She tells her family about her former romance with Scrooge.  Her husband mentions that Scrooge is now all alone in the world, as his partner, Marley, is gone, and Scrooge has no one else.  Both episodes are hard for Ebenezer to take, and he subsequently begs the Ghost of Christmas Past to take him back to his home.