Dear Amy: Recently, I ended an on-and-off relationship with a co-worker. What makes this situation even messier than it should be is the fact that I ended it because I caught him sleeping with our boss. While our personal relationship was allowed (although secret), other co-workers and I are all aware that his ongoing relationship with our boss likely would lead to both of them being terminated. Our boss is aware of the past he and I share, but the two of them have continued their relationship.