Do you believe her? Yes. Believe that she doesn't want you and doesn't want to try. That doesn't stop you from believing that her feelings can change, and there lies your hope.
Refusing to believe that she wants out, insisting that your marriage is fixable and she's doing the wrong thing, is going to push her away. It is NOT listening, NOT respecting, NOT understanding her feelings that she is being very clear about. Be willing to let her go, because it is the only way she can get enough space to make her own decision to come back. She's NOT EVER going to come back because you insisted.
This message really hit home for me. This one of of the (many) things that i really need to work on with my own sitch. I consistently try to convince my wife that things are worth working on. Thank you Adinva, This needs to be one of my main goals, to stop believeing that i know how she feels.