'The Bachelor' Why did Jef Holm and Emily Maynard Break-up?

In happier times, Jef and Emily head to Africa

It's the biggest mystery is Bachelor history. Emily Maynard and Jef Holm seemed so happy together. Following the proposal, they took a trip to Africa for Jef's company, People Water. They tweeted about their love and spent time with family and friends. Then last week, after much speculation, they confirmed their split in a joint statement to People Magazine. You can read their statement here. 

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So what happened to this promising Bachelor couple? Why did Jef and Emily call it quits? Check out this video below.