What should I do in this situation?

[Ellen]

If I was in your situation, I'd just do nothing. I mean you seem to only see him every so often, and you don't want to cause friction the next time he comes and visits by bringing this up. Sometimes people just say things spur of the moment that they don't mean. You probably just did something to piss him off, and he was venting to his friend. And about the sympathy thing, that seems a bit of a pointless thing to bring up, as some people just want to have their friends feel sympathy for them at that moment in time. Not saying it's the right thing to do. Also there's no way you could bring this up without him getting annoyed at you for actually looking on his Facebook.
That's what I'd do anyway.