Qrow's life was built on that man's lies. When he was found out, he turned tail and hid himself away, rather than confront those he'd been manipulating.

[Break really isn't supposed to be spreading details about this. Qrow makes it a point to leave Ozpin's name out of things when he complains about the unwinnable war in Remnant, expressly to keep the judgement of strangers off of him and let Ozpin have a chance at making his own fresh impressions on people.

Fortunately, Ozpin has already failed miserably at managing that with Ange anyway, and Break does not actually need to give real details to thoroughly ruin any chance that she might ever respect him ever again. Lovely!]

I wouldn't be surprised at all if he's also the source of Miss Ruby's terrible case of chosen one disease. Someone had to plant those ideas in her head.