My husband of 11 years is supportive of my writing, and patient with the time I spend immersed in it or talking about it. But he's not into writing himself, and not even particularly into reading -- especially not the type of stuff I read (sci-fi, fantasy, YA, nonfiction biographies, histories). He likes nonfiction books about cars and space and photography.
But on the flip side, he likes photography. Like, a lot. We went to Hawaii, and all the pictures from his camera are of sunsets and epic views and macro shots of plants and stuff. All the pictures from my camera are self-shots of us, doing touristy things. He does this all the time -- I'll sit and wait patiently, reading a book, as he spends 45 minutes trying to capture the exact picture he's looking for. Then at home, he'll flick through the pics on his computers and point out ridiculously miniscule differences that I'd never notice without him pointing them out.
We may be married and in love, but we're not the same person with the same interests, and that's okay. We've got some overlapping interests (motorcycles, camping, science) and some completely individual ones. As long as we're supportive and understanding, there's no issue.