“Eight years into our marriage, you think that you know somebody, and you don’t know anything about them,” says Theresa. Theresa says she thought she had a happy marriage to her husband, Dallas, with typical ups and downs. But she says on the morning of June 26, 2020, her world was turned upside down. “Six detectives came to my home, and they told me that my husband was planning on murdering me on our trip to California,” Theresa says. “This was, by far, the worst betrayal ever.” Hear how Theresa claims Dallas was planning to kill her – and what she believes his two motives were – by watching the video above. On Thursday’s episode of Dr. Phil, hear why Theresa claims Dallas forced her to take an Easter vacation by herself out of state. And, Theresa says that after the arrest, she learned Dallas was leading a secret double life. On Friday, the woman who claims she was engaged to Dallas while he was married to Theresa speaks out. Check here to see where you can watch. TELL DR. PHIL YOUR STORY: Are you involved in a story making headlines?