He won't acknowlege that he hurt me?

My ex wants to be back together with me but I'm having a hard time trusting him because he hurt me so bad in the past. I'm willing to talk it out and try to get past this but he keeps saying "I didn't hurt you". He has done so much.. even had a child with another during our relationship. I'm wooing to work past it but I can't when he won't acknowledge that he hurt me at all. I feel like he can easily hurt me again if he doesn't even feel that he hurt me at all. Is he serious or just avoiding the responsibility?