I'd assumed they'd just postponed the wedding until after her treatment was done...from what you say, it sounds like she and her fiance totally called it quits?
That is the impression I got---the only time I heard her reference it was the morning she first talked about the cancer...and when she mentioned "the wedding was off", I definitely heard regret in her voice...
I haven't heard anything else about him since...I did hear her saying last week that she is going to Alaska sometime this month...on the same days that McCain, Graham, Collins, and Clinton are going to be there.
A coincidence that she was NOT happy about, BTW.
So, going by what I haven't heard about her fiancee, I would say he is gone for good...
I seem to recall her saying in a joking fashion, that that her fiance had left her as well, when she was diagnosed with breast cancer.
It was in the context of "who your true friends are when the chips are down" so to speak.