They met in kindergarten, but long story short, Amanda had a crush on Seth since 3rd grade and didn't work up the courage to talk to him until 20 years later.
After their parents exchanged their phone numbers, Amanda texted Seth. They met up for lunch and the rest is history. It quickly became an inside joke whenever Seth stated they needed something, Amanda would say "We can register for that."
After school Seth asked Amanda if she wanted to take a walk, which was not an abnormal question besides the fact that it was below zero. While on the walk Seth called for Amanda and when she turned around he was down on one knee.