Trust is the cornerstone of a working relationship. It's important to deal with this issue head on or the problem is likely to become exacerbated over time. You might consider hiring an executive coach to support your communication. We work with coaches frequently to help us navigate challenging waters. I would dive into the issue fully and see if it can be resolved to your satisfaction. If so, you might have a great future relationship. If not, you might seriously consider moving on. As you're working through this, consider what his issues are bringing up for you. Where is the learning opportunity for you? Every challenge like this is an awesome growth opportunity. Good luck.