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.