I'm a little unsure of all the details as they relate to Colorado practices - is the home you're selling in Colorado, even though your profile says your in New Jersey? In Colorado, there is a holdover period defined in your listing agreement. IF your ex-agent has negotiated with a buyer (or a buyer's agent) and IF that buyer is on the list of names he needs to give you, and that buyer consummates the sale within the holdover period, you MAY have to pay him some commission. There are several checkboxes on your original listing agreement which will define some of the specifics. If you choose to go with another agent, definitely tell them about the situation and show them your terminated agreement. If the blow-up was for a good reason you won't scare your new agent off - and you may save yourself a lot of aggravation and expense if someone who had looked at the house previously ends up buying it. Chances are your new agent will have more insight based on the particular situation. He or she may very well also suggest you talk to an attorney to be on the safe side. You probably don't want to run the risk of having to pay double commission!
If you are considering re-listing your home, we'd e very interested in chatting in more detail!
Best of luck,
Tony & Karen