Fans think Ted and Tracy actually parted ways Bustle's list of theories about the show brings up an interesting point about the Mother: Ted never actually refers to Tracy as his wife, just calling her "your mother" to his children. Ted moving on wouldn't be a question if he and Tracy actually divorced.
The theory goes that Ted (Josh Radnor) portrayed Barney as a womaniser and a bit of a jerk so that his kids would forgive him for chasing after Robin (Cobie Smulders) – Barney's ex-wife.
This theory holds that Ted's happily ever after color is yellow, whereas Barney's happily ever after color is purple. This just means that purple people – like Robin with the purple giraffe – are not suited for Ted.
However, Lily realizes that it's the classic "Lobster situation", referring to the time Robin ate lobster when a doctor told her that she could never have it, as she is allergic to it. Since Barney told Robin that he is done trying to get her, Robin wants him back, as she always wants what she can't have.