@, nobody gets married to plan break-ups, if you look in the East side of the world, they learned a lot in life to avoid things go sour between the couples (spouse) and there are many counselling bodies/institutions that offer assistance in maintaining marriages.
It is true that in non-marital relationships, you can break off anytime and not face much obligatory processes because the difference between that and marriages is that marriage means COMMITMENT. Let's say, a staff is committed to his job and works with the same company for many years, loyally. The perks for this commitment reaps good results: raised salary, getting promoted, offered more company benefits, etc.; compared to staff that jumps from one company to another company within short term of working under the same company(s) -- same goes for anything else, even relationship. Commitment and patience gives back positive outcomes in return.
And, sorry to say this outrightly: the government hates single people. Don't believe me? Read this: http://www.cracked.com/article_17063_5-reasons-being-single-sucks-even-more-than-you-thought.html