I think it is great that you are willing to experiment in this relationship again, but keep in mind this is an experiment. The question here is what is he going to do to earn your trust? As you said, your jealousy was caused by his behavior. What concrete effort can he engage in that will help you regain your trust?
There isn’t a clean slate, so look at what caused the issues in the first place and address them directly. He needs to demonstrate that he has changed, and you need to be satisfied with his change in behavior. If you do move forward, consider a trial period. Your jealousy isn’t going to be the downfall of the relationship. His inability to address the reasons you are jealous will be.
If the trial period works and you are satisfied he has changed sufficiently, then your trust will grow. Don’t blame yourself for being jealous when the causes for the jealousy were real.