Bestfriend proposed me

Hi i am '20F'and my bestfriend is '20M' We were bestfriends talked about everything and discussed smallest details of our lives Tl;dr It was very clear from my side that i only see him as a friend and there was never any romantic touch to it and lastly i was not in any sort of relationship and neither was seeking for a boyfriend After 3yrs he decided to propose me but was too afraid hence asked a friend I was in utmost shock and decided that i should cut ties with him so he can move on and forget me(PS i was sad too because he somehow ruined our friendship) Now after sometime he has blocked me from social media when i thought i should talk to him and ask about his whereabouts Do suggest what i can do?