[fintstone]

If he showed you the house and was not the listing agent, he had every right to the portion of the commission that goes to the buyer's agent. You implicitly hired him and his time is of value. He could have sued you and/or the selling agent for a portion of the commission. He should have had you sign an agreement as such to protect himself, but not having one does not limit his ability to sue. Be sure that if the house sold to you, he would check the public records and know...and his broker would go after the commission.

He would have presented whatever offer you instructed him to.