If I remember correctly, you were the one who initiated the separation in the first place, correct? You wanted to leave your husband because you thought you were falling out of love with him before you actually knew how you felt or what you actually wanted.
Of course he's hurt. He's having trouble with trust, wondering if this is how it will always be. He's taking control of a situation where he doesn't feel in control at all. He's also getting some little digs in at you that he knows will hurt you because... wait for it... he's not just hurt, he's angry because he feels you broke up the marriage.
He needs to hear statements affirming strength of conviction.
"I'm attending counseling because I want to be the best person I can be."
"I love you. I need you. I miss you."
"I don't want to be separated any more. I don't want a divorce. I don't want our marriage to end."
"I hope that you make the choice to attend marriage counseling with me so that we can work through things. I don't expect you to forgive me right away. Counseling will be a safe place for us to talk."
"If you file for divorce, I won't sign the paperwork unless we're officially separated and have been to ____ number of marriage counseling sessions during the space of a year. I'm committed to trying to make things work for our sake and our child's sake."