Our team has been bullied at work by our boss for nearly a year now. Most of us have met with HR to discuss concerns. HR supports boss. I'm at the point of leaving (can't take it anymore) and wondered if I'd be entitled to unemployment? I work in CT.

Very likely not. UI is meant for workers who lose jobs through no fault of their own, not for those who quit. If it appears things are not going to change, find a new position first before you quit.