What are the reasons for ellipsis'?

A punctuation mark. Example [...] In writing, an ellipsis is a series of three periods (dots) that indicate an omission. They look like this: ... or . . . They are most often used with quoted...

The first is to describe why something HAD TO happen. The second is to describe why something DID happen.Just "the reason" is what it is, and it can be used in three different ways. You used two of...

Reason is the ability of comprehending, inferring, or thinking, and the use of logic. It is otherwise known as the intellect.

All of the reasons are all people. You'll have to read the book to understand why each one pertains to her suicide, 13 people, 13 reasons why [she killed herself] Happy reading!