I AM NOT AN ADVOCATE BUT HAVE FOUGHT A DIVORCE CASE, A DV CASE, AND WON ALL THE WAY UP TO HIGH COURT ON MY OWN WHILE MY WIFE, NOW EX-WIFE, HIRED AN ARMY OF ADVOCATES.
First, the law is very clear on one aspect. If she has refused to stay with you, and you have proof of this, then you do not have to pay maintenance, unless, of course, she can prove that you had made it impossible for her to live with you. If it is merely that the relationship has come to a DEAD END, then that is not enough reason for her to stay away from you and ask for maintenance.
Also, don't you want a divorce from her? If so, this may be a good opportunity for you to file an application with the Family Court and ask it to frame another issue: "Is the respondent entitled to a decree of divorce?" For this, you may have to file a cross-application to seek divorce.
There will be cross-examinations or are they over? Make sure that you present all your evidence to her when she is a witness otherwise it may not be admissible. To do this properly, first make a list of what your arguments will be and then, accordingly, prepare what you are going to ask her in her cross-. Make sure that every evidence you have is presented and marked as an Exhibit on the record. Then reference these Exhibits in your arguments by exhibit number.
Also, if your wife is working, file a counter-application seeking maintenance from her. Yes! Do it if she is working! Go on the attack.
Hope all this helps. If you need case laws based upon your specific circumstances, let me know, I have lots of them! Good Luck!!