I got an "encouragement" card in the mail once from a stranger (to me) in my mother's Sunday school class. She'd put me on a prayer list and I have no doubt she was specific with them as to why I needed praying for. The next time I spoke to my mom I asked her if it had ever occurred to her that maybe I didn't want my personal business broadcasted to the entire congregation (come on-- we know word gets around) of her church. But even though I was annoyed by what she'd done, I also knew it came from a place of love.
My point is that even though I agree with you a hundred percent that your business was not his to share with anyone, maybe consider that he didn't see it as a betrayal. Maybe he thought the people he told would support you. I can't know his motivations, but maybe just consider that they were good.
Please try to talk to him as calmly and rationally as you can about how what he did hurt you and the kind of support that will be most helpful.
Don't let this derail you. Be strong! Hugs to you.