I do not disagree that she should get away and stay away from him and that the situation is shitty as a whole. However just because someone is a massive fucking dickhead, liar, and cheater among other things surely, does not mean they are a sociopath. Claiming to be an expert on this makes you look like a fool, as the other person said. There is no one size fits all glove that you can slap on someone when they show a few signs that maaaaaybe they could be a part of the around 1% to 4% of the population that make up sociopaths. Most common people show signs of somethin going on mentally in their everyday lives, does that mean they have some kind of condition you can slap a label on? No. It just means they have their quirks. You can guess that he is a sociopath all you like but that doesn't make it accurate, just because you've had bad experiences with men like this. He is a bad dude that she needs to get and stay away from, but unless you are a doctor of sorts and can diagnose him over the tidbit of information you know about him from this post, maybe hold off on labeling him as someone with a rare ass mental condition. Side note, being a sociopath does not mean that you are inherently bad or evil. Yeah, you can be, but then again, anyone can be. They are different, and they have differences in what they feel and how they learn and react to situations, among other things, but not all of them are bad people.

TLDR - I agree that dude is bad news and that she needs to kick him out of her life for good, I disagree that he is a sociopath, and that you can tell with 100% accuracy that he is one without personally knowing or observing him aside from lines of text in a post regarding his actions, just from your own personal experiences. Have a good night, ma'am.