Hiii This Is Vibha Sanghani Here I M Very Much

Hiii this is vibha sanghani here I m very much tensed with my 9 yrs old child what happened is he went to his friends place to play n there he asked her put her top up n he touched her on stomach next day my friend told me this I was very shocked to hear this n I waas not able to digest I said it is not possible as I know him as very obedient n sincere child he topper in class also when I aasked him he straight away told me I did not do it he took god promise .our promise n according to us he never gives false promise n nemxt day was his exam so we did not remove the topic today his exams r over so today again I grilled him saying they have cctv n they r going to check n then he told yes I had done that I m really ashamed of him now n now I think I don't know him at all I don't know how to deal with this situation can u plz help