I am also sorry to hear your wife is drawing away from you. I would advise using humor with her. When she gives you the evil eye or says something nastyy say "ouch!" If you can joke about being ignored and left alone while she's goes off to do JW activities, that would be good. Try to be light hearted, cute and funny. Draw her back to you by contrasting cult life with the fun she could be having with you.
Best wishes to you.