Learning the dharma from a monk who has created root downfalls/expelled

Being vague for the sake of not speaking divisive or malicious speech. I know of a monk who had sex with nun(s) and was disrobed/expelled (later reordained too) From my perspective, a lay person, would it be wise to not learn the dharma from a person like this who has created such a root downfall (I don't know the correct term, but broken vows that cause one to be expelled) I don't mean be harmful to the person either (of course) I just mean should I as a lay practitioner not listen to this person in regards to dharma?