What is something someone you know told nonchalantly about their partner that made you realize they were being abused?

I have had a few moments like that, the worst one was when my cousin told me that her live in boyfriend of two years told her that her furniture at her grandparents house (which they had lived in together rent free for 18 months, they moved to his apartment when the house was sold after the grandparents died and he insisted on bringing back only his luxurious furniture and to leave her cheap furniture behind) "wasn't his problem" when her parents required her to remove all the furniture before the house was officially put on sale... she said it like this was mildly annoying but normal and her parents heard her say this to me and said nothing. I was actively baffled for days afterwards.