I am not sure how I feel about marriage.
Marriage is considered a cultural union. I believe that this is becoming less and less of a thing. 
Yes I have noticed that trend too.
more people just continue to date long term rather than marriage. its to explore whether they are romantically or sexually compatible. 
I like that idea better than a costly wedding and even more costly divorce.
absolutely, divorce laws vary but you have to deal with alimony and child custody if they had kids. 
Yes and it is very stressful too.
Psychological stress
In psychology, stress is a feeling of strain and pressure. Stress is a type of psychological pain. Small amounts of stress may be desired, beneficial, and even healthy. Positive stress helps improve athletic performance. It also plays a factor in motivation, adaptation, and reaction to the environment. Excessive amounts of stress, however, may lead to bodily harm. Stress can increase the risk of strokes, heart attacks, ulcers, and mental illnesses such as depression.
Stress can be external and related
acknowledged his personal attraction to Olivia de Havilland, assertions by film historians that they were romantically involved during the filming of "Robin Hood" were denied by de Havilland. "Yes, we did fall in love and I believe that this is evident in the screen chemistry between us," she told an interviewer in 2009. "But his circumstances [Flynn's marriage to Damita] at the time prevented the relationship going further. I have not talked about it a great deal but the relationship was not consummated. Chemistry was