in need of advice for a problem

Ok I’ve been in a relationship with my husband. Then we got married and have been for three years but within that time he has hit more then once before we got married then after because he kept telling me I was cheating and I wasn’t I work and come straight home to tend to him the house and my son. When he acused me at this time I was sitting on the chair. I told him I wasn’t then laughed cause it was crazy to think I was, then after I did this he walked over and punched me in the face I fell back and hit the table which knocked a hole in my hair all the while my son has seen this, we went to couseling. and the only thing he said was it was my fault. so he left but came back and I keep thinking he’s gonna hit me again. so I started talking to someone online. It was only e-mails then we met and now were dating but my husband still comes to the house and I want him to leave but I’m afraid he might hit me again or worse. Anyway the young man I am seeing loves me very much and I love him. My son has seen him and talked to him almost everynight. My mom has taken my son some nights and I see him almost everyday and see him almost everynight. He asked me to marry him and he already started looking for a new house to put me and omar in I explained what happen with my husband and he is nothing like him and adores me calls me every morning and every night before he gets off of work and twice everynight. I truly love this man but I don’t want to hurt my husband and I don’t want him to get violent towards me or my new found love. . I’m also affraid of not having the finacial means to leave with my son I have a job but I don’t really have family to watch him while I keep us from being kicked out of our apartment. can someone please give me sound advice on what to do!