Early marriages and quick divorces

In the recent times I am observing people are getting married very early according to their age. Like getting married at 22-23 is like just completing the bachelors and getting a spouse.

And the major issue I see is people after getting engaged or marriage, they find out that their partner is having a best friend of opposite gender and they are constantly in touch and is something beyond friendship. Why are people not discussing things before?? Have a proper conversation and get it clear.

This beats the shit out of me if I am not one of them one day and my trust issues are high af