He called her names when she demanded the truth.
gaslighting
gaslighting

Woman confronts boyfriend after catching his ‘cruel’ at-home behavior: ‘He is gaslighting you’

Gaslight, gatekeep, girlboss: How a satirical twist on ‘live, laugh, love’ became the internet’s new mantra
Let’s unpack the hottest new alliterative phrase that’s permeating the internet.

Woman praised for her no-nonsense response to her boyfriend’s ‘gaslighting’
Here’s the thing, though — it’s not real.