The two of your need to acknowledge there are trust problems. If you say you do not trust him, he may remind you that you strayed too. Tell him what he must do for you to trust him. He, in turn, will tell you what you must do. Then both of you must follow through.

If you continue to question his trustworthiness despite him doing what you have asked of him, you will have a decision to make. Perhaps, more conditions; or ending the relationship.