Marriage issues. A week. please help me.

I have been married since three years. my wife quarrels for small small things and gets violent. She always try to find fault in me and always blames me for my past. This is my second marriage and my first wife was in similar nature. For small arguments she tries to commit suicide and always threaten me to complaint in police if I say anything which is unpleasant to her. she always tries to bring up my old relationship that my ex wife left me because of my fault and abuses me. I cannot concentrate on my work. it is hampering my day to day life. I dont have any relationship to anyone other than my wife and I try to concentrate on current life. she always wants divorce from me for small small arguments for example if talk to my mom in absent of her. she makes this big issue and quarrels a week. please help me.