quit over (someone or something)
To quit or resign from one's place of employment. Although he didn't say it, it's pretty clear that Tom quit over the lingering suspicions surrounding him. I can't believe you quit over some bozo who was being mean to you.
quit over someone or something
to stop working or doing something because of someone or something; to quit because of a dispute over someone or something. Please don't quit over a silly thing like that. She quit over one of her fellow workers.