S'mon said:
Or even "Betrothed", since you clearly do intend to marry you just don't want to say you're Engaged.
Yeah. It sounds silly. But I'm kind of a romantic, and I want to do the whole 9 yards of the official proposal routine before I start calling us "engaged."
If financial and career circumstances permitted, I'd just as soon go ahead with it now. But they don't, so I can't. And I'm not the kind of person who can handle being "engaged" for four years. There are enough people on our backs about our "official status" now. My mother, for one, would be absolutely UNBEARABLE by year 3 of an "official" engagement.
As for the rest, we've only lived in the same structure intermittently throughout. At other times, we've been within about a half mile of each other. And at the extreme, she's spent significant portions of her time overseas. So we probably don't qualify for "common law" status.
Swack-Iron, "partner" while I like the idea behind it, is out if only because of where I work. I work among very, um... liberal... academics. "Partner" is a strange term around here. Often a person's "partner" and their wife aren't the same person. I think I confuse them enough without having to regularly explain the concept of "monogamy" to them.
Agback, I kind of like "inamorata", despite Katerek's reservations

, but I think she'd think I was insane.