I wish I hadn't supported my wife
Why would you wish that you hadn't supported your wife in the past?
I've been miserable ever since.
It's wrong to not support a spouse in their time of need. Although you may be feeling miserable now, she likely appreciates what you did for her and will probably always remember it.
You sound like my wife. She never stops complaining about my lack of support.
you still don't support your wife? You should learn to support her starting now so she doesn't complain.