Loss of a "Friend"!?!

Ok, Saturday the 21st, I log onto my WoW account. An ex-guildie now on another server asks about my now infamous nephew. This friend is one that was once his sugar momma, and did not speak to me for almost a year because he told her not to. LOL! I wonder, what power does this kid have over older women that do not live close enough to verify his ..., umm, prowess? So she tells me the most recent wrong she is accussing him of, and the bad juju, kharma, etc, etc...., that follows it. Me having no clue where he is or what the hell he is up to, give a half ass answer. So then I log onto FB a lil while ago and find a message from her to me on how she already knew his location and his wrong doings. ( umm, ok) Now she is pissed at me because she expected the truth from me, "since she has been honest with me." (ROTFLMFAO!!!!) So now she unfriends me on WoW and I guess she deleted or suspended her FB account because she can no longer be found on FB. Or maybe she created a new acct under a differant name. But, now I wonder, "Am I supposed to be upset that she is angry at me and unfriended me"? I mean, honestly! Am I my nephew's keeper? Am I at fault for his actions? He is 23 years old, a legal adult. All I know is that he left Monday morning on an "emergency" and said he wouldn't be back till the 24th. Hell, maybe it was a great thing that she unfriended me, not like we talk, at all.