How to verify an agent is being ethical

[Jackson Pontsler]

My wife and I purchased a flip off the MLS a little bit ago. Everything went along well till a bit of a hiccup at the end when the seller (owns the neighboring property) realized they didn't have a direct driveway into the property and tried to 3 hours after anyone signed get an easement off of us to get access to use our driveway (no way too much liability). Well that same neighboring house is now under contract and I'm concerned that the selling agent may not have disclosed that the driveway isn't communal. Is there anyway to verify because the last thing I would want is a problem for the new buyer and me because the old owner didn't want to dish out money to put in a drive way on his property.