Hi Anduman,
You are welcome here. Do you suspect your wife of having BPD? You can check some of the Perspective Articles over here in the banner on the right --->.
The degree to which we analyse something is personal and what's too much is quite subjective. I have a friend, who irritates me intensely because of his habit / ability to sort something with one sentence. To me, the conversation has just started, to him there's no reason to think about it any further. I am sure he is just as confused by my interest in continuing to think about it as I am by his lack of interest.
How do you deal with the discussions? Can you give an example of a recent issue in which your wife over-analysed something?
You might find this article on listening with empathy helpful.
https://bpdfamily.com/content/listen-with-empathy