What does it mean to say that someone is my "North Star" in English? Any allusions?

In English, "you are my north star" usually means that someone is very important in his life or career, plays a role in pointing out the direction and has a very grateful meaning.

Polaris refers to the conspicuous star closest to the north celestial pole at any time. Polaris has played a guiding role in human history for a long time. The determination of ancient navigation direction and even today's field direction are inseparable from Polaris. Polaris has become a very important indicator, and it is also a constellation to identify the direction of stargazing, which is very important in astrophotography, observation and positioning.

People in Europe and America worship Polaris. The location of the North Pole Star is convenient for European and American residents to observe. When the weather is clear at night, Polaris is easy to see with the naked eye, which is very eye-catching. Therefore, there is such a saying.