This time she is saying she doesn't want things to end but shes just tired of fighting
No one chooses to live in limbo. This sounds like cake-eating to me.
Do you have access to her phone records online? If so, take a look and see if she's been calling/texting with someone regularly. Don't let her know that you're investigating. The fact that she always has her phone with her or face down is telling that she is hiding something.
