Absolutely not, you are doing the right thing.
When a man who did not treat u right, when he had the chance suddenly want to b "friends" means he want to have his cake & eat it too. He want to continue to have u in his, life use your opinion, your emotions, and has no intention of changing himself.
U deserve better than to waste time with him, even to be his friends. There is lots of people to be friends with and u want to give your time to someone who values u. (even a pet is better)
You are brave enough to move on. That's is the best way. Don't return any of his texts ever again. Unless by some chance u want to have a relationship with him.
I am proud of u, not too many women can make the emotional cut off as u have done, and these women end up suffering, hoping against hope that by some miracle "he will change".