Affair with boss gone crazy

I've been working in a cam studio for over four years and started an affair with my married boss three years ago. I genuinely fell for him. He promised me he ll leave his wife so we can be together. But six months ago, I discovered he was lying to me and also was involved with other girls from our studio. I want to end things, but he's threatening to block my accounts and ban me and share intimate photos and videos of me on social media. I'm heartbroken and feel trapped. If any of you have been through something similar or have advice, I'd really appreciate your help. I’m lost…