Many people who have been knocked down in relationships let it ruin their new relationship. There are ways to overcome that and have a healthy and beautiful relationship.
Don't enter a relationship thinking that the other person is going to complete you. You are in a relationship because you are in love. You should still be able to do what you love and not depend on someone else to make you happy. You are with this person because you love and want them.
On the first date don't talk about your ex or why your last relationship end. He shouldn't be talking about the issues in his last relationship. You are with this person because you are going to start on a new journey. This person is not the last person so give this person a chance.
Don't start off the relationship with a negative attitude. Just because some guy hurt you in the past does not mean that all guys will. There will be a guy who will treat you right. Give someone the benefit of the doubt before you have reasons to not trust him.
If you found someone new then great. Love is a great feeling and don't make the mistake by bringing your past problems into this new relationship. You never know this guy might be the one for you. So don't do anything to mess it up.