drugs, hoes he had, so called friends(his friends) ruin my family. is there any hope?

He was my high school sweet heart. we had a boy now 8, ajd daughter now 3. Lets take go way back from 2008-2009.we had our little flaws not a biggy we were trying to adjust our life style living together and my pregnancy hormones. After having my son things got better. so in love and he proposed back 2013( Valentine's day) great night ever.We concieved our little baby girl that year(2013) but during my pregnancy he started changing. Coming home late, hanging around friends, and you know all that package. we had strong arguments which i didnt have a great pregnancy i cried alot my last 6 months of gestation. long story short he completely change to worse after my baby girl arrived. he kept hanging with his friends and i notice he wasmt sleeping at. later on i notice he was doing drugs(snorted meth)and cheated pn me. i wanted to move on and that where the abuse started. i had hell of a ride. Now 2017 he wants to make things good. he is incarcerated for 5 yrs. he asked me tp forgive him after i caught him in another lie before he got arrested.which i didnt believe and i just dont believe him.after lies, abuse,drugs, and not to mention the bitch got pregnant too.Baby is 2 yrs old and she tells him that she dont want the baby around me knowing very well she knew we were together.yesIs there any hope of change? idk what to do.. i was happy with him until he chose all this instead of family. help!!! ( dont judge just put your self in my shoes)its really a long story and tried to shorten it .