No, there does not have to be evidence of injury to you. Quite a few of domestic violence crimes do not have any evidence of physical injury and are the alleged victim's word against the Defendant's word. It will be up to the jury to decide if the alleged victim is credible beyond all reasonable doubt to convict. The jury does not have to believe the Defendant because the Defendant is presumed innocent and does not have to prove anything.
My response to your question is a generic response and should not be construed as controlling to your case. I can not effectively advise about your case without knowing all the facts. Additionally, my response does not create an attorney-client relationship. You can contact my office to schedule an appointment if you would like to have me represent you.
These are often he-said she-said cases. The signs of violence are not conclusive either way. I have heard of victims harming themselves to get someone arrested. The police will often arrest both parties if they accuse each other of violence.