I've known my wife 30 years now, married 26. She is definitely my best friend. We have a lot of similar feelings/interests about things but also enough differences to not clash or whatever if that makes sense.
We don't hold hands when walking (no particular reason) and always sit facing each other.
It's really nice to be able to talk around her like most guys talk to their buddies. There is nothing I can say around her that would offend her, as long as it's not directed at her.