It's almost never easy to contemplate ending a relationship so this is a natural process she is going through and expressing to you.
If you allow her to safely continue expressing these feelings without becoming argumentative with her and asking "Then wtf are we split up?!"....I think you will lay the ground work for her to continue expressing herself to you - positively AND negatively - and this type of COMMUNICATION can be your marriage's saving grace.
It's as simple as listening - and then thinking before you respond - and THEN responding with love no matter what the issue at hand IS. It means remaining vulnerable to a point. So you just have to ask yourself if you're willing to do that...
