What are the reasons you are married? Or will get married? Or are planning on getting married? And how does being married changes your relationship with your Spouse in a way not being married to him/her could not? Hope the question makes sense... :P
Edit: Does your marriage last "until death do [you] part"? (Question directed to those already married I guess... :/)
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Marriage brings commitment that other relationships just don't bring. You have to work hard to keep a marriage. It's not fluffy "I love you"s until you get tired and date someone else.