Toriel left Asgore to rot in the dirt after a nasty divorce. Most people assumed it was Asgore who caused their relationship to crumble. However, when Sans took a turn on the dating block with Toriel, a cheating girlfriend in their terrible relationship leaves him to realize Asgore wasn't to blame. Also, he and Asgore had a lot in common. And the King had a very cute beard. Who knew?