Oh op 
You're in a panic state at the moment, as you said, which means it's hard for you to think this through rationally (but I'm not suggesting you're irrational) and it's compounded by the traumatic experience you've been through.
The priority is to make sure you feel safe and you can work out how best to do that.
We advise that this breach of professional conduct needs to be reported because then remedial steps can be taken to ensure that you are safe and feel it, too.
If you do nothing, you will continue to worry and panic about what might happen without the support and reassurance of others.
Shed a light on what's happened here - fear hides in darkness.
If you share what's occurred with the people around you, not only will they take steps to make sure you remain protected but they'll be able to help and support you through the confusion and fear that you experience as a result.
Please don't try to do this alone.
There's a reason he told you things to make it sound like he's vulnerable and that's to ensure your silence. You can take your power back here, though, and ensure that you are safe and supported with the help of others.
As a pp said, he hasn't committed a crime so nothing bad will happen to him. It may even be the trigger needed for him to get the right help and support that he needs.
Trauma means we think of the worst imaginable scenarios when we're under stress, because our self-protection system goes into overdrive. You need the support of others to help manage the fear and anxiety and reassure you that these worst things won't happen.
And we will support you every step too.
You know this, that you need others to help you through this new thing, because you've reached out to us here. Read this thread back as many times as you need when you're in a less heightened state of being.
For now, try to centre yourself so that you can get some rest. Do you have any techniques that help or would you like us to offer some guidance?