If you don't care, just wait until summer ends and re-list after you dump this guy and pull it off the market.
However, if you really want to get it out there and listed now and get this process, you still need to dump him. He's a sleazy piece of shit.
If it's the second answer, let him know that you're going to find a different realtor and that you feel he acted unethically, which of course invalidates the contract you signed that would guarantee him the commission should the house sell in less than 90 days.
If he argues back on the contract, tell him you believe he purposely low-balled the offer after being dishonest about a relative moving to town whom he showed the house, and that your attorney actually wants you to go ahead and let his company know what he did so that they can review his history.
But, you just would rather not deal with all of that and simply want the contract voided so that you both can move on more easily.
If it's the first answer, though, and you still want some payback, I'd call his office and let the branch manager know the entire story.