A Scheduling Conflict
I once witnessed a bride show up almost two hours late to her own wedding. This was in Southern California, in an open field with no water and no shade. She shows up and wants to get married in her yoga outfit. The groom got very angry and shut the whole thing down.
When she refused to change her clothes, the groom decided to just leave her there looking stupid and they never got married. I spoke with my uncle and it turns out that the groom had been having some suspicions that his fiancé was sleeping with her personal trainer.
When she showed up to the wedding in her yoga outfit, it was all he needed to see to call off the wedding. She ended up getting married to her personal trainer shortly after, and then they got divorced soon after. Story credit: Reddit / toxictribe