steady
/ˈstɛdi/
a person loved by another person
Chinese meaning: 稳定的伴侣；固定对象
He introduced his steady to his parents during the holiday dinner.
他在假日晚餐上把他的固定伴侣介绍给了父母。
After years of dating, they decided to become each other's steady.
经过多年约会，他们决定成为彼此的稳定伴侣。