This means that the agent that you have put your trust in may be working for the other side as well. When you first contact a real estate agent, remember that they are not your agent until you sign agreement for them to represent you. Until then, they are not required to keep anything you say in confidence. The agent is required to give you a notice of that at first contact. When you decide on an agent, you have the option of hiring either a single agent or a transactional broker.
Some agents work only as one or the other.
Others will work as both. While it seems obvious that it is preferable to have an agent represent you alone, the catch is your agent won't be able to remain yours exclusively if you want to see listings or sell your house to other clients of your agent's brokerage firm. If your agent happens to work for a large brokerage firm that could be stifling. Just as a law firm will turn down cases if a lawyer for the firm already represents the other side, a brokerage firm may not represent both the seller and buyer of a house as a single agent. At that point, the agent you originally hired to be your exclusive agent must become a transactional broker, who legally represents both sides to a limited degree.