I can definitely relate to this...feeling so different, but just when I was around the Psychopath...
I would see him and just light up. When his smile wasn't on mine, things seemed "normal". I wasn't being gaslighted when he wasn't around. I didn't have demands made of me. I didn't spend money on stuff for him that I couldn't afford myself. When it ended, there was no money in the checking account, no food in the fridge, all my pain medication was gone and was assaulted.
I'm bipolar and he had started to use that to manipulate me, my moods. Sometimes I would just be drowning in tears while he just sat there. Other times he could make me think I was the most important thing in the world.
I am grateful that I didn't put up with this for very long. I guess my healing won't take as long, but I've met a lot of wonderful people on this board.