Why does August tell June to marry Neil?

In The Secret Life Of Bees

The second morning of the vigil, August discovers a suicide note out nearby where they found May's body. May penned that August and June should not be miserable, but in its place be happy that May is with her parents, sibling, and grandmother. Even though she was exhausted of carrying the blues of the world, it was her stage to pass away but their time to live. August tells June she need to marry Neil and stop being scared to take a risk.