Phrases Talking About Work Experience

I quit my job because...

Meaning

I resigned from my position due to...

John: So, what are you up to these days?
Alice: Oh, I'm looking for a new job. <b>I quit my job because</b> of the long hours.
John: Oh, I'm sorry to hear that. That's too bad.
Alice: It was a tough decision, but necessary. <b>I quit my job because</b> I needed a better work/life balance.