These kinds if issues often occur when there's an outside influence on the marriage.
Meaning another man, or even possibly just a friend shitting on me?
I don't know what "a friend shitting" on you actually means, (other than being another man.) Is there someone you are thinking of?
At any rate, given your w's actual post partum issues and recently having a baby, I would not point to the direction of another man.
Of course I could be wrong, but this^^ is a situation that raises an alternative to an affair.
And you need to work on what you can control, which is yourself and your own behaviors.
If it's related to your dynamics (and there are real issues therein) and needing help with the baby and any other stressors,
time AND Your own changes are what you can/should do.
I mean, just from what I'm reading, which is from your viewpoint, I sense some "Stuff" for you.
Nothing rare about that. We're all human. But to simply point to another man and focus on that,
to me, is really counter productive.
hang in there, focus on You and Your work. Be supportive to your wife for now but stop waiting to hear the "word" divorce, when actions are what matters.
My h denied wanting a divorce when I asked, AND he said he'd tell me if he did want one...
but all of his actions said otherwise.
M: 57 H: 60 M: 35 yrs S30,D28,D19 H off to Alaska 2006 Recon 7/07- 8/08 *2016* X = "ALASKA 2.0" GROUND HOG DAY I File D 10/16 OW DIV 2/26/2018 X marries OW 5/2016