Boyfriend immigrated to Hong Kong.

You can apply for permanent residence in Hong Kong directly if you have lived in Hong Kong for more than five years and have lived in Hong Kong for more than 1 year and seven years.

(The premise is that you are employed in Hong Kong, not that mainland business foreigners cannot apply for permanent resident status. This is shown on the pass. )

Whether you marry your boyfriend or not has no effect on your application for permanent residence. Because you work and settle in Hong Kong, you can apply for permanent residence directly as long as you have lived for the legal period.

Ordinary mainlanders can only apply for one-way permits to settle in Hong Kong after four years of marriage with Hong Kong people (non-permanent), and can only apply for permanent residents after seven years of residence.