How to legally deal with the situation if you are being harmed and abu

My wife has verbally abused me and physically harmed me, as well as self-harmed on two occasions in the last six months during trivial arguments. Despite these incidents, she has expressed remorse verbally many times in the past. I am concerned that she may harm herself or me again in the future during another argument. I am considering asking her to sign a document on stamp paper stating that if she harms herself or abuses me in the future, it will be her responsibility. Would this be a prudent course of action? Would such a document hold any legal weight in the event of future incidents or if I decide to file for divorce? Additionally, could this document be used against me in the future, suggesting that I forced her to sign it?