No but he still could especially if the abuse is serious and continues but the Law doesn't force him to say anything here and he may tell you to do so but all up to you here. Just don't let this get out of hand before you really get beat up or worse and it does happen. Good luck
YOU should report it. You deserve better. Don't wait. Get help.
Therapist's mandates vary from state to state, if you are in the US, healthcare providers do have mandates for domestic abuse.
Please stay safe and keep violence out of your home and your life.
Yes she can. Regardless of age a therapist has to keep everything safe unless their client or another person is in danger.