Watching the earlier portion of the show got me thinking about what went on between the three of them.
[spoiler]Carolyn and Joe seemed to have a good thing going until Burke showed up and Carolyn became infatuated with him. Burke only wanted to use her as a weapon to hurt her mother and her uncle, which was wrong of him. On the other hand, Carolyn's treatment of Joe was equally terrible. She only wanted to go out with him whenever she was uncertain of Burke, yet the moment he was able to charm her again, she tossed Joe aside.[/spoiler]
All matters aside, I liked Joe better with Maggie anyway. She was better for him than Carolyn ever tried to be.