I agree with Jeffrey. In NC in this situation they must have you sign a dual agency addendum and if you still want them to represent you they have to become a designated dual agent. Now I personally do not do that. If the situation arises I refer out the buyer. Now if you decide to keep the agent they can no longer negotiate for you or the seller. They have prior financial knowledge and information on both parties. They are reduced to a paper handler. So you really need to get a buyer agent and then have someone 100% on your side.
In many states, for the agent in your situation to continue talking with you, they need to advise you they are representing the seller, and hence, since they are no longer representing you, you should go get your own agent. Or, they need to ask for your written approval for them to act as a dual agent (a.k.a. intermediary), where they will facilitate the transaction between you and the seller, but they are not providing representation of either party over the other.
Personally, I would run away from a dual agency situation as fast as I could and still find another agent to represent me. It's the only way you can provide the highest assurance that you are getting a fair shake. Your agent may not like it, but they know it's your choice.