No, No, No.

There is no try.

Either she commits to this for the rest of the marriage, forever, or it's over. She is playing you. She is saying inside her head, "I'll try this for awhile since I don't want to lose him, but when he feels good about us again and doesn't want to divorce, I can probably go back to doing what I did before."

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She wont be going back. Unless she divorces me. Of this you can be sure. SHe isnt trying it like that rather she is trying to see if she can be happy sans him.