Mimi was very clear with Travis (according to her sworn testimony) that she was not interested romantically in Travis, told him so, and said they would only be friends. When Travis invited her to Cancun before she accepted she again made sure he understood there was nothing romantic about her going and she would only go as a friend, nothing more.
Travis may have continued to harbor feelings for Mimi, but they were not dating, she was not interested in him romantically, and that's the sworn testimony. Anything else is pure speculation...fiction.