Getting married doesn't make you happier; being the type of person who gets married (and stays married) correlates with being happier. From the linked article:
Data from the 15-year study of over 24,000 individuals living in Germany also indicates that most people who get married and stayed married are more satisfied with their lives than their non-married peers long before the marriage occurred.
I've heard somewhere that after you exclude divorced and widowed people, the correlation between being married and happiness entirely disappears. I tried regoogling it without success, but maybe more effort will get you the original research.
Whenever the topic of happiness is mentioned, it's always discussed like it's the most important thing in the world. People talk about it like they would a hidden treasure or a rare beast - you have to seek it, hunt it, ensnare it and hold it tight, or it'll slip through your fingers. Perhaps it's just the contrarian in me, but this seems misguided - happiness shouldn't be searched for like the holy grail. Not that I don't want to be happy, but is that really the purpose of my life - to have my neurons stimulated in a way that feels good, and try to keep that up until I die? Why don't I just slip myself into a Soma-coma then? Of course, anything I do boils down to a particular stimulation of neurons, but that doesn't mean there's not something better to aspire to. To pursue happiness as an end itself I think, is backwards. It wasn't built into our brains because evolution was being nice - it's there because it increases our fitness. Happiness is designed to get us somewhere, not to be a destination in itself.