Board Thread:The Flash episode discussions/@comment-9346948-20150520010255/@comment-24688171-20150521094410

I think Eddie dying was a bad decision, he just did what he thought was right. In that loop, Nora would live too!

A millennium of events can't be fixed, but it can't continue either. So nature's system overloads and decided to rip off everything. And that's when the black hole was created.

P.S. Just my speculation!