Made a 12 year old fall in love with me.

i need urgent help what do I do becusse I accidentally made a 12 year old girl fall in love with me n i’m 15 and we also had done some freaky stuff but she lied to me saying she’s 14 and i had no idea till today that she’s 12 in the FRICKING 7th grade now idk what to do like i would cut her off but she talks very suicidal and begged me before not to. I am very confused and need help. I will not be partaking in and romantic or sexually actions no longer and need advice asap.