After a lead-up of several episodes, we finally learned what happened between Kate (Chrissie Metz, Hanna Zeile) and co-worker and boyfriend Marc. As expected, there was much ugliness to be seen.
The more experience you have with domestic violence, the easier it may have been for you to recognize the signs. Kate's desperate "Are you mad at me?" is a telltale sign that Marc is withholding and angry about small, petty things. Abusers want to keep the victims they're grooming off-balance. Unbalanced people are easier to knock down.