They do feel anger and envy in full force. But I don't think they feel much fear, and so I don't believe that they can truly be depressed, or anxious, or stressed. My ex faked anxiety and depression near the end of our relationship, and I know it was faked because the timing of all of it was just too convenient, and I later found out he began an intense relationship with a brand new, main target right when he started talking about the "anxiety" and "depression." That's not a coincidence. It means it was all a lie. Besides, during that time, he told me he's always been in control and that he can handle stress very well. He was always as cool as a cucumber, so I think he was telling the truth in that statement. But it comes from not feeling the full range of human emotions, which, at the time, I didn't even know was possible! And, he often forgot to lock my apartment door behind him when he came in during the evenings. Interesting anecdote, isn't it?
So, the charm the psychopath is showing you, as you know, is all an act. They are good at imitation and impression management. They spend their entire lives watching people, mimicking and mirroring them, and then they use that knowledge to exploit others in order to get what they want. One thing is for sure...they do NOT feel bad about anything! They do not feel guilt or remorse, because they do not care. And they come back around and hoover targets back in because they want to use others and have power over them. Everything is a game, and they have to win. So the hoovering is about control. He views you as an object. You are a toy that he's not done with yet. It's apparently really fun for them to pick up a "toy," play with it, and throw it down, over and over and over again, until the toy is destroyed.