Rae was fighting with depression and suicide, the last person she's thought could actually save her did. He was there at the right time and he couldn't let her try it again so he took care of her.
Trigger warning for suicide
Levy Miller didn't consider herself a lucky person. Least of all when the world she knew ended.
But there's always glory and gore in surviving.
Disclaimer: TWD does not belong to me, but the characters do