Say you shortly dated some female type lady girl and you knew her ex-boyfriend was a psychopath. This being stated not only by herself although witnessed more than once first hand, Having seen these behaviours several times and making note that something non normal was going on. Even between them before and during the adverse scenarios I find myself in with this display of weirdness. Yet you cannot talk directly to this person due to the off chance you could be slightly wrong with who the person was, although there is a high percentage chance that it was them being who they are. Would you (A) make a comment about how you realize her ex boyfriend was indeed a psychopath after having witnessed strange events that have nothing to do with your friendship yet still confirm those realities. Would you (B) investigate and see if the ex-boyfriend was really the one causing myself and the female issues and not say anything to the girl themselves until figuring out wtf was going on. Or would you (C) do absolutely nothing and wait for the opportune time when the ex-boyfriend fucks up and then expose his harassing behaviours of not only potentially myself, though her as well. Strange story, later twice 3:00 in the morning or maybe more in front of my building I hear screaming and other rowdy talking. With her name being mentioned and comments about myself. Waking up half the building several times - with Police being called to deal with this potential ex-boyfriend that has no clue on what is really going on. Or that I overheard most of the conversations taking place. The odd scenario is I stopped conversate with the female maybe half a year in advance never speaking to her again, yet wonder still if this particular ex is going to cause problems with myself even though nothing more than a few dates took place.