You have committed a mistake by filing divorce without filing a RCR (which is a petition to restore conjugal rights) or at least sending legal notices to her to come back and wait for two years. You know she would not be coming. That would have been enough for you to file for divorce based upon desertion by her. Now, it is relatively difficult. It is not too late. Simultaneously amend the petition and ask for RCR in the alternate or file a separate RCR if required. Throughout the proceeding pretend that you desperately want her back. Drag the case for two years and then amend the divorce petition to seek divorce based upon RCR too. Do not discuss your strategy fully with your advocate. That moron will go and disclose it to the opposite party. Now that you have entered the legal realm of matrimonial disputes, start reading on the law. Do your own research. If you are in this forum, sure you can do some research on the net.
As for all her ridiculous demands and false allegations, prepare all the evidence you have. At this time, make sure that in your rejoinder (i.e. reply to her written statement, if the Judge allows it), every allegation is denied in toto. If not, do so in your affidavit and do it with specificity.
If you can afford it, hire a licensed private detective and get hard evidence about her affair, if any. I think you will be surprised. Licensed private detective is a must so you can have him as a witness in Court along with his affidavit. All this will help. Again, DO NOT discuss this with your advocate or for that matter with anyone...
I do not blame you for a lack of strategy. Your advocate should have advised you. But most likely he is not fully familiar with the law or has the IQ to strategize. He probably knows some sections in the applicable Acts and some CPC and Cr.PC here and there. Remember that advocates in India have very poor academic credentials and choose this professional mostly because they have no other choice. They have a very low IQ, poor ethical and moral standard, close to zero knowledge of any subject other than some law-basics and a desperate desire to make a lot of money at all costs. So, you would be a fool to rely only on your advocate in your legal problems. 90% of the work should be done by you. Use your advocate mostly like a dog, to bark in Court and to send misinformation to the other party. If you want some misleading information to reach your wife, tell your advocate in confidence and tell him not to discuss it with your wife's advocate. Be sure, it will be discussed promptly!!!