"Are today's couples happy together?"

Judging by the divorce rate it seems not at first, but that only became an option for most Canadians in 1967. Before that the best you could get was a legal separation, which was a throwback to getting Church permission to live apart.

OTOH my wife and I are still together, 2 of the other 3 women in her Honours microbiology cohort were happily married and 3 other couples we still see from college are happily married. Only two couples of college chums divorced. Choosing partners wisely make a big difference.