Most Helpful Guy
It's usually due to the overemphasis on sex, as per my observation. These days instead of sex being a part of a relationship, people base the relationship around sex. The value of human emotions and emotional bonding has decreased, and it's mostly about sex now.2
Most Helpful Girl
Communication, compromising and sacrifices for each other are all paramount if a relationship is to survive or not.
It's easy to make a relationship work during good times, but the challenges a couple faces dertermines the strength of their love.
People need to work together and fight to stay together when they face problems and issues within the relationship. Most people give up on each too easily and too quickly.2