When Relationships End, Shouldn't Questions?

I'm going to keep this short and sweet because I'm honestly shocked that this conversation took place today, but feel the need to pose the question: Why, when you've ended a relationship with someone do they feel the need to ask questions that arose in a conversation that happened with someone you haven't spoken to since before you two even broke up? Hard to follow, so I'll just spill the beans here.

Apparently someone said something to an ex that led him to believe I was spreading rumors about him on Facebook. Even if that were the case, which it is not, why on earth bring it up now? Does this help us in our 'going nowhere' attempt at acquaintances? I think not. So then why bring this up in the first place?

Let me paint an even better picture. You have not spoken to this person in something like six months! Even if I were to honestly say - yeah...you know what...I did. I wrote horrible things about you on Facebook and all of cyberspace has determined that you were not the best boyfriend...does that make you feel better? Probably not. And also...imagine all of these things when you're well past the closure point. Even more pointless.

So I would like to know...does anyone have any rationale for this nonsense? Or is this just another attempt at a man trying to 'make a point.'

Help me out here people!