This isn't about the woman or her husband, more about Reddit and its users.
In this part she has a genuine concern about what her husband is up to.
In this part she finds out the girl is the daughter of the husband from when he was younger.
Clearly everyone has different advice to give depending upon what they know of the situation.
I only bring this up to illustrate the madness of crowds/groupthink/peer pressure and how it influences acceptable choices at any given moment via upvotes and comments.
This is applied to modern journalism regularly to get clicks and increase advertising revenue, which in turn can be funnelled via corporate and political motivations.
Easy example of something more sinister.
It is hard to tell what is fake and what isn't nowadays. The internet and media amplify problems to be much bigger than they actually are. I know people with actually healthy marriages. I also know people who don't have healthy marriages, people who are perpetually single, and people who have disappeared off the face of the earth.