I can remember hearing that story about that Jessie character some months ago and all I can really say is that Jesse is 100% responsible for what happened. And what she did to the original poster's wife is truly a horrible and abhorrent.
TL:DR Two stories, three women total, all of them absolutely refuse to take accountability and admit they did wrong, to the point that two of the three choose the easy way out instead of admitting guilt and seeking atonement.
Not for the first. The first was freshly postpartum and diagnosed with PPD. Seems like her friend got deep in her head and coupled with her mental illness plus her hormones, had a meltdown. Her friend is the villain. As for the second story, she caused her own demise.