We can’t possibly know what is really going on, but I see it as 3 possible scenarios
1. wife is delusional/paranoid
2. husband is abusive/controlling
3. or something in the middle- bits of both of these but in a non-pathological way, maybe husband has a more domineering/stronger personality, wife is not assertive but has grown to resent it, so sees everything in a more sinister light. If this is the case, then hopefully counseling for both can help and avoid the divorce.
If the wife is convinced that the husband is abusive for either reason 1 or 2, then it is much more serious.