If I’m not married or engaged by 25, but dating someone, I’ll still call them my girlfriend.
Get married then you can soon call them Plaintiff .
words of wisdom .... even after you are 75, call her your girlfriend / lover / wife as if all three have the same meaning. Tell her it still feels like you are dating.
It will earn you big brownie points.
What you should do is joke around with women that laugh real loud in a foreign country. Down the busiest street you can find. And everybody blows their horns. Tell your sweetheart to wiggle her ass. You can safely cross the street at that time.