You do because there is a court-ordered subpoena requiring you to attend. If you do not show up you can be charged with contempt of court, jailed and fined.
Another reason to show up is that if you do not testify or do not testify truthfully, he will beat you or someone else. That is the known pattern. Protect yourself and others by testifying.
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You have to show up. Subpoena literally means "under penalty." It is a means used to force a witness to testify. Very few non-party witnesses, like you, want to testify. The subpoena means that they, and you, have to appear. One of the other attorneys suggested that you may be the victim of abuse or afraid that you will become a victim of abuse by the defendant. If this is so, you should speak with the prosecutor. Most prosecutors’ offices have a person assigned to help victims and witnesses. If all else fails, when you show up you or your attorney can ask the judge for additional protection. Under some circumstances, you may have the right to refuse to testify under your rights against self-incrimination. In that case, the prosecutor may have to take the additional step of immunizing you. This a question on which you need legal advice which we can not provide here.. Good luck.
THESE COMMENTS ARE NOT LEGAL ADVICE. They are provided for informational purposes only. Actual legal advice can only be provided after consultation by an attorney licensed in your jurisdiction. Answering this question does not create an attorney-client relationship or otherwise require further consultation.