Read the following conversation:
A : My mind was telling me to say, "Don't go".
B : What are you thinking?
A : [continues thinking].... Not even for him.
There were just two people, A and B. So, Thinking about "even" for emphasis is not in the vicinity. My research told me that "even" could also mean "Fair". So, we could interpret as "A" wanting to tell him to stay but also feels it as unfair for him.
OR there's something else going on?
Is that an idiom?