Yup, but we can't make an accurate diagnosis here... His wife needs treatment for that.
Don't you think its best to err on the side of caution here and just let the words slide until we find out for sure?
You will regret it if we find out she does have depression... I know I would. So I am reccomending taking the hits for now... and I don't normally DO that right? Normally I Do advocate aggressively asserting boundaries... but there's no affair going on here to be worried about.. OIN put that to rest by showing up at OM's workplace. Just an angry wayward spouse... whom I think has depression.
I think OIN just needs to keep after that Family Therapist hunt and get his wife the help she needs... or at least the help I think she needs.