Conceptual

Was introduced to a concept that I'd never heard before a week ago, now I've heard and read about it in several places.
It's called "gas-lighting".
Apparently it's from the 1930's play and movie adaptation "gas light" and has been used quite regularly since then. News to me.
Some signs that gas lighting might be occurring:

• You walk on egg shells because you don't know what will and won't set a person off
• You are constantly told you are too emotional and sensitive
• You find yourself apologizing and constantly taking the blame for things
• You are told that your memory of an event is wrong
• You stop talking about your issues for fear of ridicule

I guess it's just a form of manipulation/abuse but I found it interesting that I've never heard of it before.