How is this counsellor going to help me?

Counselors can normally help by giving you advice on how to cope with your previous abuse and helping relax you mentally. He will talk to you, and become friends with you, and hope to find out the cause of why you're so afraid still. He'll try to see if it's due to your new boyfriend, or due to paranoia. He could also prescribe you with something, or try other therapeutic methods to help you cope. Best wishes and I hope you feel better soon.