Depends on your state laws. Some states the realtors are always working for the seller, whether they are helping the buyer or the seller. Some states you can have a realtor representing the buyer. Some state’s there is the option that the reator represents the “deal.”
Do you know what type of agreement you have with your realtor? They probably provided you with a disclosure to sign.
Even if they are representing you they also have a vested interest in the deal closing of course. When I was a realtor (I am still licensed, but not a realtor) if I believed my client was getting harmed, I would have supported the dealing falling apart, or doing what I had to to protect my client. I don’t like to see anyone be treated unfairly, I always would have treated them as I would want to be treated, same with my partner. But, that does not always happen of course. Sometimes a seller or buyer is going through some buyer’s or seller’s remorse, or might have their expectations a little off for the realities of the market and might feel their realtor is not helping them when indeed they are.
But, there are plenty of realtors just looking towards their own bottom line, who don’t care about giving good service, and don’t think long term. They aren’t thinking you will use them in the future or refer them etc.
I should mention that not only are their laws governing what type of relationship your realtor owes you, but being part of the realtor association requires and extra layer of ethical conduct.
My best advice is get a referral from a friend if you can. Read the disclosures you are given. If no disclosures a provided look up your state, actually you can look up the law in your state ahead of time. I do recommend using a realtor. On the buyers side it is almost always worth it to use a realtor.