Will I be charged?

I have been hared by my ex-girlfriends borthers. They have scratched my car/let down tyres etc. About 1 month ago I decided to go to my exes flat one morning and ask her if she would maybe speak to her brothers and ask them to stop. When I eventually asked she went mad and started shouting, she pushed me 3 times and kicked me and spat at me. To my horror I was later arrested and released on bail without charge for common ault. As my ex claims I barged into her house and attacked her which is complete rubbish. She has no marks, except for a little scratch on her hand, which she probably done pushing me. The Crown Prosecution are going to decide if there is enough evidence to charge me. There were no witnesses as it was inside her flat. What can I do? I can not prove I did not do anything so will I get charged and go to court then prison? I have never been in trouble with the police before. I have made a counter allegation against her as she actually attacked me. Help!!