What do you do when you find out your bestfriend likes you?? for girls?

soo one of my bestfriends which is a guy have known eachother sinse middleschool but havent really been close until my freshman year and my sophmore year is when we became bestfriends and i used too like him alote but just decided to see him as a friend and hes a senior and at aboutt the last week of skool i noticed he was actin different in a flirty way with the way he would hugg me and *** behind me and put his hands ovr my eyes and i found out from my friend that he said to her not to tell me that he likes me but im soo confused idk how i feel about him anymore what should i doo helpp??