Long Term Relationship ?

In The Name of Allah.
What is long term relationships?
One would define it as having years of relationship, where both have been in love more than a year. Someone might still date even after 10 years.
To be perfectly honest, I once thought that LTR is a romantic things. Two people know each others and in love for numbers of years before settle down with marriage.
But the question is, numbers of couple didn't end up with marriage. They end up breaking up and found someone new then getting married maybe only months after that. 
So how does it feels for you? 
Didn't you just wasting your time, energy and money to the wrong people? Isn't wasted?
At one point, i also think LTR is kind of cruel. Imagine, a man gave u hope and u wait for him maybe for 10 years like a fool and end up getting cheated on or breaking up due to some circumstances. 
True, every relationship even marriage is like sailing on a boat without knowing there might be thunder or typhoon. But, non marriage relationship gives u nothing but wasting time and sins. 
Even in Islam, couple or any relationship before marriage is haram. As it wanted to protect the relationship and prevent people from zina and unmoral acts.
O Allah, 
prevent me from any haram relationship and protect me from wasting my time, energy and money to the wrong people. I believe in you, and I give myself to you.