He fingered me next to my freind

So Basicly I snuck with a freind to this boys house well flat I had only ever been present in there FaceTime chats never spoken to him didn’t know he existed even so we snuck round and I was in his room with her she was with him in his single bed joking around kissing hugging basic things I was standing . Awkwardly on my phone he joke around and said just getbin so jokingly I got in the bed he had his hands down her pants I could see as she did him they were kissing then me and him somehow spooned I still on my phone felt akward af then he started stroking my thumb no clue why then he glided his hand on my stomach slowly moving down then my back then agressively grouping me geabbing me in my vagina then he put his hands down my pants what I didn’t know he was doing similar to my freind we didn’t know after I sat on the floor shaking he asked why I lied and said I was cold I havent told anyone it happend in May I cannot tell anyone coz I don’t want to be a slag I feel like a tramp but my hearts telling me I should give him another chance what do I do lie to my family or take him back Need some advice on my situation