earthmate
Your earthmate is someone you’ve been stuck with since the beginning of time. They’re your lover, your lover’s lover, or the person who gave you the worst STD in the history of the universe.
My earthmate is the one who gave me the plague in the 13th century. I haven’t forgiven her.
I’ve been with my earthmate for 20,000 years. We’ve had more breakups than a middle school.
My earthmate is the reason I was born in a pig’s body. I still hate her.