I think it's important to take things slow right now, realise that reporting him isn't your primary concern at the moment, you have time to do that. (I think you can still put in a complaint up to 5 years after the event, but check with your area)

Right now, you are going to feel some intense emotions, you are grieving for someone you had a lot of feelings for and the loss will be immense. He is going to apologise and minimise and definitely won't take much responsibility for what he's done because he'll know he could get in a lot of trouble if he admits what he's done.

Can you find yourself a new therapist who can support you thru this?