1. For quite some time, there has been a popular How I Met Your Mother theory among fans that the Mother dies before 2030, and Ted has been telling his children these stories to help them remember her.
2. And after the March 3 episode, that theory was all but confirmed, and even those who assumed the worst were devastated.
4. The outcome was first foreshadowed in Season 8, Episode 20, when Ted showed up at the Mother’s door, explaining how they’re going to meet in 45 days, fall in love, get married, and have children.
Because he wanted those extra 45 days with her.