My Bestfriend Girlfriend Likes Me What Should I Do?

It started when I was in 9th class a beautiful Girl Taken Admission To my school And same class My best friend Like her from 1st day and he Proposed Her In Just 1-2 months And She Rejected Him But She Had Lot Of Interest Same as Me Like : anime , Games , physics and I am quite Good in Talking From Since 6 Bcz I used To live Stream a Lot That Time So We Started Talking But I am not interested her in that time she use to ask me my insta account, snap and all even I have gf or not but I reject her everytime to not hurt my friend Then We Came into 10th my friend Got Another Crush She Still Likes Me And Then I started liking her But As An Introvert I can't Talk much Now after 3 years we are in 12th Last Year my friend dated many of girls after that one but she is still single I am too we never dated We Have Good Bonding But Neither I am approaching nor she what should I do And I don't want to hurt my best friend either.