警察昨晚帶走他了

這已經是他第5次動手了，我曾經警告過他，再動粗我就會報警，沒有用的。。。記得有一篇研究報道寫的是男人打老婆這種事發生過3次後他就會成"癮",其實在第一次過後我就應該狠下心來和他離婚,也不至於到今天這種地步.
昨晚我抱著小孩子他還一直的推我,把我們推倒在地上幾次,小孩子哭得太厲害,我要一直都抱著他, 打了我的臉,還舉起小吸塵器威脅要打死我,要我給他下跪...後來我隻好和他說軟化,把他騙到離我有一定距離的地方,溜了個空抱著小孩子跑到鄰居家報的警...
直到警察來了...我看到他給警察寫的about what happend, 取輕避重不說還捏曲事實,基本上把自己說的沒什末錯,隻是"碰了我肩膀 to stopped me from running too fast, since i was holding the child" blah blah ... 我身上沒有什末傷, 這給他編造理由創造了條件. the police told me that they will release him this morning at 8, then he is allowed to come back home to get his belongings, but not without accompnay with a police.
我不能也從來沒有想過要去"毀了" 他,但事情到今天這個地步我隻能是盡最大努力給我自己和孩子一個公平和安全保障.i have to protect my own rights.
今天是sunday, the offices are closed, i am sitting here in front of the computer, wishing all of these did not happen to my family,but i also know that i will have to face the reality, as i said, i have to protect my own rights and get divorce from him, could anyone please advice what my next steps are?
P.S. i know for sure that he will flight with me for the custody of our son who is now 2 years old. i will do anything to make sure that the custody is mine, please please advice. this is from canada

thank you for your time.