hi Minato, and

generally speaking, the divorce threats are something you want to try to nip in the bud...end altogether, ideally.
that wont be easy. it sounds like this has been going on for a long time. it may be your wifes go to when things get over heated.
as a starting point, i might treat it that way. she may just be communicating that her frustration has reached too high a point and communication has broken down.
a time out is certainly more ideal in that case.
have you ever told her how the threats make you feel?