It saddens me to witness so much skepticism about love and relationships. I guess it’s normal now to enter a certain relationship with an expiration date and  also withholding something because there is no trust. A couple that has no concept of sacred and eternal vow isn’t likely to make it. 
I was fed, as the average guy is, a bunch of lies about relationships. Some hyper idealistic where there  was no strain or pain, or sacrifice, some only focused on the hedonistic side, portraying casual relationships as something advisable. 
We grew up with this kind of propaganda, marriage wasn’t the focus anymore, building a family wasn’t the cornerstone. As a result we have lots of godless people, enslaved by hedonistic apetite with no capacity to sacrifice and build a proper family, and an additional fertility crisis.  This is the basis from which many of the political problems we witness are stemming from. We need to start building proper families in order to achieve any sort of social cohesion . 

 You're not the only one thinking this and unfortunately we will probably have a generation of people who never have families.  

There is no concept of commitment anymore because there is no social scrutiny on relationships.  In rural small town communities this social scrutiny is still very strong and "normal" relationships still form and exist.  The "everyone go to college" generation ended up moving to cities and this social cohesion is lost.

Millennials and gen z are properly messed up with relationships. 

 Definitely, here in Portugal in rural communities you can still see a glimpse of upheld tradition and proper families.  As you well observed, the urbanites are much more prone to loss of social cohesion and college is mostly ideological propaganda nowadays. 
Millennials and gen z are fed relentless propaganda about fake social principles and the ethics of hedonism and egotism. 
I think the only viable option is to provide them with some counter culture, it is the most we can do.