I think I found this definition for you Rhapsody :-)

"satisfy in a limited way; "He contented himself with one glass of beer per day"

http://wordnet.princeton.edu/perl/webwn?s=content

I think it's hard to judge anyone else's marriage/love life as we're not there 24/7 and over the years, etc. so don't know the smaller nuiances. But given your definition, I'd have to say I'm "happy." Why am I happy instead of merely content? My husband gives me room to "develop" and cheers me on but doesn't "expect" anything of me, merely appreciates me. We let one another "be" the people we are and don't get in one another's sun but try to water each other.

We have shared jokes/points of view and if we're apart we're curious about what the other has seen/done while we've been apart; even if it's only with his being up in the office and me down here at the dining room table! I love to think of little presents/surprises for him, often bring him some little thing if I go shopping alone (or even with him at the grocery store as he is not very observant :-) and he'll read aloud to me if I ask, while I rub his damaged foot that hurts him often. We "share" our lives together and that makes me happy. I like warmth and sharing and I guess he does too :-)