Cancellation of Matchmaking After Vort - Does the Matchmaker Return the Payment?

I would appreciate it if the question could be directed directly to Rabbi Fried himself. I have been a matchmaker for 7 years, thank God, and I perform my work faithfully and with dedication. I inform everyone that I charge a fee after the vort. I made a match between a yeshiva boy in Bnei Brak and a seminary girl, which, thank God, reached completion, and the vort took place on the 20th of Sivan. About a week after the vort, the boy paid me the full matchmaking fee of 2500 shekels. The girl has not yet paid. Two weeks after the vort, the girl decided she wanted to cancel the vort because various things the boy said or did did not please her, and after consulting with her rabbi, it was decided to cancel the match. It is important to note that the boy and girl are mentally and physically healthy, and there is no mistake here, but it is purely a matter of compatibility. After the wedding was canceled, the boy is now demanding that I return the matchmaking fee to him and claims that this is according to the instructions of Rabbi Fried, shlita. The girl, on the other hand, says she will pay everything because she understands that I charge a fee after the vort and am unfortunately not supposed to take responsibility after the cancellation of the vort for reasons not dependent on me. What is the ruling here? Should I return the payment to him? I would appreciate a detailed response from Rabbi Fried as the boy relies on him greatly. Thank you very much.

Hello

According to the instructions of the Gaon, Rabbi Fried, shlita

If it is a mistake, the money is returned,  and if it is not a mistake, the money is not returned.

It is not known what information the boy provided.

  It is necessary to hear the arguments of both sides together and check  whether it was indeed a mistake or not.

According to the instructions of the Gaon, Rabbi Fried, shlita