Theresa has been in love with Ethan Winthrop since she was a little girl and has always been determined to marry him, no matter what it takes. She came close to fulfilling this dream, until her many lies caught up with her and Ethan left her. However, she remains sure that one day, thanks to "fate," she and Ethan will be together.

After losing custody of her daughter Jane, Theresa married Alistair in an attempt to get her (and Ethan) back! Alistair later was presumed dead, leaving Theresa in control of Crane Industries.

Theresa found love with Jared Casey but ultimately decided to be with Ethan when he became available, but she was briefly blackmailed into marrying Jared. Now, Theresa and Ethan are working on being together again.