I lived with a gas lighter for four years - it was so destructive and had me thinking I was crazy, doubting myself and my perceptions. I found it quite damaging.

Now your getting it !
Why are you still with this person ?
Trusting the wrong person leads to a weak mind .

It starts with something like that but gaslighting and manipulation is very dangerous and gets worse. The boundary manipulation grows as he progressively tests them to see what he can get away with. They know how to make you doubt yourself and make their victims feel and look crazy. I learned more than I cared to about sociopathic and psychopathic narcissistic disorders the last 5 years, how they project their traits, gaslight, isolate their victims, and get others to do their abuse by proxy, collectively disempowering their target. If it gets bad enough you try complaining about men like him, you'll be shocked & disgusted to find out how many abusers/sympathizers intervene to defend them. It's an abuser-centred world that fails the real victims every time. Leave while you're aware and can before it gets worse. Nobody cares when it comes down to it and takes their side, they have a way. Let him continue manipulating and getting away with it, without you there.

It’s amazing how they do this! I wish I had a video of my conversations with this guy so that I could analyze how he manipulated me and others. Manipulators must be so smart. Too bad they don’t use it for good.

Self Esteem and fear loneliness that's why they're fucked up and possessive about anyone they hang with.
People like that are easy to spot and give themselves away easily.
It's their predictability that shows