Hello,
1) You can first go for revision and then you can also approach the supreme Court. The law is clear on the point that Wife is entitled to maintenance from the date of application not from the date of order. You can read the judgement here --------------- http://www.livelaw.in/wife-entitled-maintenance-date-application-date-order-sc/
2) Withdrawal of he divorce case will bear no effect on the maintenance case.
3) If you don't want to live with her, then you continue with the case in the Family Court.
Also I would advise you that you file a SLP on the ground that the maintenance that has been granted is high and not on the ground that maintenance should be from date of application.
Also you can tell me as to this ground was taken by you earlier before the High Court or not??
Regards