Can one get divorce on the basis of pre-marital affairs of husband?

I married just 4 month ago. I did love marrige . Before marrige he has physical relationship with 3 to 4 girls before me. I found one pendrive in which i saw his porn video with girls. I told him this then he hited me very badly. After this he also said sorry and requesting for forgive him. But i am very much shocked and i m not able to accept this. But this all happened in last month and i am yet staying with him. I told him for divorce and went to my mom dad's house but some how he take back me with him.Now i don't have trust any more.But if i go to my parent house he did something and get me back. so i can't go to my parents house. Now a days he also do not allowing talking with my parents. I had all proof of my husbands relationship with other girls i had those all video which i saw in his pendrive. My another question is that after marrige somany times he hitted me in last 4 moth whenever quarrel happend. But then after some days we are living normally. So can i get divorce .