I really think this is a family problem and not an immigration problem. The way I see it is that it will not impact your MIL much because her daughter is now a citizen and she can file for her. In my humble opinion, once you withdraw the petition, it's going to increase your marital problem and drive a wedge between you and your wife. At that point, your wife may just divorce you.
I believe you and your wife should go to counseling and see if you can work out your problem, and your wife should be able to "control" her mother.
Good luck to you.
OP, please keep us posted and let us know if he contact you again. He was definitely carrying "belly" (grudge) for you. Be happy he is gone. Something tells me that he will try to enter the US when he departs Europe. He is not that smart.
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