Split Personality (DID) or a Really Good Actor?

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Keep in mind, as you read this, I'm the sort of "phantom person" in this situation- I know far more than I should but it is driving me nuts because I think there can be more than "just something wrong with him (hence the title)." Once a good person, this man fallen down the barrel at age 21 (pretty sad if you ask me, but oh well).We all know the taboo terms for sociopath and split personality, etc. but how do you know if you have encountered one? Many people that I have asked say the is probably playing, just bored, and wants conflict to deal with (and although that might be true) there are somethings that he has done that seem rather scary. For example, he struck his latest ex (not hard enough to leave a scar, but struck her none the less), and accused her for cheating when she did nothing of the sort-- mind you, I don't want the response "oh she's probably lying"-- that's not what I am asking. And the reason why I am so concerned is that there is a new victim. You see, he apparently got tired of his ex girlfriend for who knows what. so he dumped her, they tried to get back together but that didn't work out, and so they tried to remain friends. This man, mind you, appears to be flat out loosing his mind. Again, out of nowhere, he calls his latest ex and says "I don't want to be freinds with you, I never want to see you again." Then later he apologized and they kept on communicating. That worked for about a couple of weeks before the guy had decided to tell everyone that "he found someone else... a minor no doubt! Now, he has had no apparent contact with this minor and all of the sudden he is proclaiming that he is in love with her and she is the one. A couple of days pass until today... when his latest ex (who I am friends with) texts me and asks if I was in any form of contact with the guy... now I am not an ex girlfriend but he was still mean to me when he saw his plan had failed (that's a sotry for another time), so I changed all my info- e-mail addresses, IM account, screen names, got a new myspace profile and EVEN changed my cell phone number. This guy is dangerous. I told her that I swore I didn't contact him and she told me, that, after about 1 week and a half of no communication, he says to her via text (what an idiot), "You have made it onto my bad list, I never wanna hear from you again, you are a horrible person." And then she tells me today that he says "What are you talking about? I don't remember that conversation at all." and yes I saw the message, you can tell that both were from him due to his bad grammar. There are several more accounts of him "not remembering" conversations with this ex girlfriend and one sign of DID is amnesia. He's also been known for anxiety attacks. SP what do you guys think, do you think he is just messing around or is there something seriously wrong with him?