Having one true friend is awesome. Having more than one is even better. There are over 7 billion people on the planet...if your wife doesn't want to be the kind of friend you need then go out and find a friend. Being a "spiritual mate" might be what she dreams of but you can also dream of her being an "awake JW". The reality is that perhaps you should not have religious discussions and just agree to disagree on that.
If you need to "vent" about things JW, then find a friend for that. I have some friends who are good for that but not good for talking about sports. There is usually not a "one size fits all" perfect friend or perfect spouse. That is an unreality that is perpetuated by so many. I can advise a good marriage counselor as he might help you both learn to communicate more effectively and more successfully. Or a good therapist who might advise you on how to make new friendships now that you are older.
Just my 2 cents...