Boyle and Dawson are both very private people, which if you work in the public eye just makes good sense, so the time that the two of them were together for is unconfirmed as they didn't announce the beginning or the end of their relationship. Although it is speculated that they met and got together on the set of Trance, Dawson has stated that she has known Boyle for a very long time due to a project that they did together years before. No one knows anything more than that, which usually suggests that there's a fairly juicy story in there somewhere.