'You'll leave when you're ready' advice would never have worked for me.
The point for me was no-one saw his abuse and I couldn't disclose it. However there was so many signals, and if people had asked me, maybe I could have disclosed the financial and emotional abuse.
I never contemplated leaving. I believed it would get better.
In the end, he was making so many threats that via my parents (who had now got some sense of the situation) I met with a barrister. He told me bluntly in 5 minutes that my marriage was over & I should stop facilitating his behaviour. (He also spoke about how abusive my H was being but I still couldn't see that. Didn't for ages after).
In my case, hearing that unequivocal statement, provided me with the courage to tell my H, a week later, to leave, after another abusive incident. He did, a few days later.
I think different advice is pertinent in different situations. However, it all starts with asking someone if they are ok, and do they want to talk. I tried to tell my sister & my best friend several times, they didn't see it, and they didn't want to hear.