Wife of colleague abusing and harassing at my home

I'm a single woman, and my married male colleague and I had an affair. He has been married for 15 years and they have a son of 14years. Their marriage has never been harmonious according to my colleague. The wife is very dominant and abusive also. He has asked her for divorce after getting into an affair with me but she has refused for MCD. She along with the child abuse him everyday and on many occasions I've heard screams and shouts of help from him over phone. On one occasion she hit him with a spanner on his head and leg and he literally had to run for his life from home. The wife is not agreeing to divorce him and has started abusing me as well. She has the support of her parents and brother and his wife and her son. She even barged into my home with the whole gang at 1am, by keeping her husband under cuffs. She came and strangled me and hit me and pushed me (of which I have CC camera footage). She and her family abused my mother and me and threatened to kill her husband and put the blame on me (of which I have a phone recording). They forced alcohol down his throat(Unfortunately there is no evidence of this.) This woman and her son have screenshots of some or WhatsApp messages and photos that we shared. She also has a few voice recordings. The wife and her family are blackmailing my colleague that if he divorces her, then they will defame me and my colleague. We both have reputable jobs and can't afford this to affect our careers. She has no demands in particular but to only defame us and doesn't want to divorce her husband but doesn't want to live with him also. I've been through physical trauma because of her attacks on me. She has also caused a lot of collateral damage to our reputation in my Neighbourhood. I want to safeguard myself first. But my family is against me going to the police for this because of dignity. My colleague also wants a divorce. What is the best way to handle this situation?