I agree with everyone else about him needing to earn back your trust, however I would also be looking at why you said no to the original request because TBH it didn't sound unreasonable. He is almost a teenager and if you want him to stay within the boundaries, then I believe it is important for those boundaries to be reasonable. So perhaps once he has regained your trust then you could sit down with him and set the rules together, so that you are both happy with the rules as they have been set.