physical altercation with partner

So my husband of 6 years has been working out of town for about 2 months now. hes gone mon-sat morning. he just got a promotion, and him working out of town is only temporary. this past weekend, he came home exhausted, and irritable. i know hes tired, so i do my best to make him feel at ease when he comes home. he was just snapping at every little thing i did, nothing was right. so i chose to ignore it and leave him alone. we went to sleep and when he woke up in the morning he was still snapping at me.. i didnt say anything, i just tried to brush it off. im normally the calm one trying to keep the balance between us the kids and the house. but i just broke, with the distance between me and him, so i let a few tears go he looked at me, and just snapped started cussing, yelling, calling names. and i couldnt take it anymore. i said "i get your tired but that doesnt mean you get to walk around and smile at everyone else while you push me aside and treat me as if im the target when im trying to make youre time home easier," he walked away and yells out "shut the F up, you just need to stop " i yelled back " no because im trying here and you act like im the problem here." (im sitting on the bed with our 1yo son while the other kids are playing outside) i turn to grab the baby and he comes up behind me grabs me by the back of my neck and my arm picks me up and slam me down on the bed. i started kicking and yelling "get off of me, let go" he got off of me. and just stood there staring at me not knowing what to do... i yelled at him "are you crazy, you need to leave, get away from me, get the F out of here, just go" and he went outside. he didnt leave, but we havent spoke either.. for 2 days. he got up at 4 am monday morning and i heard him crying in the living room before he left. i dont know how to handle this. his relationship before me was bad, he was incarserated for 3 years. he got his prior children taken away because of the domestic violence charges he has, he has his children back because of me. i helped him get them, the biological mother was on drugs and left, and hasnt been seen or heard from, his family tells me that im good for him hes changed so much from who he was. he told me he would never do to me what he has done in the past to others. i dont know what to do. this is the first time something like this has happened to us. we have 2 children of our own together plus his 3 that i take care of. i love him, but i just feel numb almost emotionally and detatched from everything, advice?