Domestic Abuse Help

Hello... I am in need of some advice at this point in my life, I divorced my husband of 2 yrs after living a roller coaster marriage...he was abusing drugs, not working and being physically, mentally and emotionally abusive towards me. We have a 3 yr old daughter, he tells me that he hit rock bottom and seems to be getting back on track - he is working now and is no longer doing drugs since he is on probation - he was in jail for drug charges... we have gone out to th epark, movies, lake with our daughter and i love spending time all togehter... but i am still afraid of the past. I am scared that the way that he controlled me in the past and became abusive, will come bk to haunt me again. I have love for him, we have been divorced for 2 yrs already, I owuld like to believe that he is changing and wants to continue to change but I am afraid. I do not know how long this will last and if it is possible for soemone who used to do drugs and be abusive, can change? I heard people do but how do i find the courage to trust in him again?? email: byochoa@comcast.net, thank you and hope to hear form you soon, take care.