i did not like here

I recently engaged in a problem i.e.on mutual agreement we loved each other that only after parents aggrement we get marriage each other. but my parents did not accept.so ithought to separate...i am sincere to here.i even did not touch her once.but she cheated and went to police station and filed a case ,I don't have any option infront of police station I signed a letter that I will marry that girl after 9 months...my parents also signed on that 100bond paper...that girl parents also approved for that....but I don't like that girl.....what should I do now....