...businesslike?
... equals in relationship standing?
I'm not a huge fan of being referred to as someone's girlfriend. (or wife, for that matter) Saying their "my other half" implies that alone I am incomplete.
Partner says to me that we are equals, of equal dominance in the relationship, is delightfully gender neutral, and doesn't carry all of the baggage that girlfriend, wife, boyfriend, husband, or snookums have.
And yeah, part of being in a good relationship is a little bit businesslike, at least for me. Planning meals, working out finances, living arrangements, making compromises....