Bio Dad has been absent for most of daughter's life now he wants back?

I had my daughter when I was 17 years old. Today she is a beautiful 12 year old that is thriving. Her biological father has only seen her maybe 30 days in her life and I think that would be generous. When she was a baby he did a lot of in and out and finally when she was six he disappeared. I got married and my husband wanted to adopt her. We went through the motions and her bio dad signed papers terminating his parental rights for my husband to adopt her. The adoption was complete and a week later I found out that my husband was cheating constantly and then one night he put his hands on me. Needless to say my daughter and I left and had the adoption overturned. My attorney tried to notify her bio dad but he never showed up to court so I was granted full/sole custody. That was in 2007 and he hadn’t seen her since late 2005 early 2006. Now here we are and she is 12 and he has decided he made a mistake he wants to see her.

My questions are what do I do? Let him see her (because logically I know that is what she wants)? Get a lawyer involved?

He has said that he understand that everything is on my terms as far as when and how much he can see her so that he can re-gain some trust from both of us. Personally I have to remove myself from the situation. I can only focus on what is best for her. I don’t know what is the best to do from a legal stand point. Could he take me to court? Would a judge entertain this since he has chosen time and time again to not be in her life?