I don’t know what to say update

Just a year ago I finally decided to leave my husband but on a bad note with just the clothes on my back after he had beaten me and strangled me until I begged for him to let me go. I left to my mom house and didn’t return until weeks later when I knew he was at work so I could retrieve my clothes and some of my child clothing. When I entered the home, I saw a pregnancy text in our home and of course I took pictures of it. I never confronted him about it but always had it in the back of my mind that he might have gotten somebody pregnant. On today, I found out that he has a newborn son and a four year old daughter we been together since 2010 but got married in 2017 l. We are still legally married and he has a woman living in our home we shared and have two children while we are married and not even helping me with the two we have together and totally neglected and abandoned them. I am in a list of words right now.

Update: His sister who told me about the children that my husband allegedly have told me that she didn’t want me to mention nothing to my husband nor his mother that also knew The whole time about them and haven’t mentioned it to me and we supposedly have a close relationship. Both his sister and mom lives with him. and because she (the sister) doesn’t want to get kicked out she asked me to not mention him having children to him nor my children and to my lawyer. I told her that I appreciate her telling me but if she think I’m not going to mention it she is insane. I know it sounds petty to keep my children from seeing them for a while cause they live with him but I am disgusted all across the board because I am extremely close with the mom and sister and I understand that is their family but for them to hang out with me going on trips together etc. and didn’t say something really pissed me off as well and been knowing well over a year now and not to mention watched me struggle with his children and all I’ve had to go through. I know this may just be temporary but I don’t want no parts of his family around me nor my children after I get the proof of the children