I've been happily married for over 10 years. Of course, I've been married for 29 years in total.... that's the joke.
Seriously, after 29 + years, I am very happy to be married to QW, and she claims to feel the same about me. It hasn't all been roses and red hot sex, but there has been quite a bit of that. And, she's my very best friend and strongest supporter. I love her more than I ever believed I had to give.
It all clicked when I abandoned my selfishness. Until then, I can't say whether I was truly committed. I often wondered why I wasn't getting what I thought I wanted and deserved out of marriage. Sex was about me, money was about me, everything was me, me, me. I was emotionally immature and I'm lucky QW stuck with me until I grew up. Now, together, we have as much fun and joy as we can handle... plus some red hot sex... maybe not quite as frequently as when we were younger, but it's still there when we want it
It's easy to start out feeling happy about being married. Long term shared happiness is something you grow into.