If you choose to report this, it's going to be a real struggle and you need to understand that from the get-go. If you have a sister, an Aunt, a female friend who can be with you every step of the way, that is a significant positive. Or maybe you can ask the ethics board or whatever they call it, if they can appoint someone to be your advocate and be with you every step of the way. Or you can choose to go it alone, but it is likely to take a lot of your energy.
The professional review board is likely to rule that it's indeterminate or that it's a 'misunderstanding' or that it was 'inappropriate' behavior on his part. And this abusive clown of a therapist is likely to lie big time.
Even if you still have the stuff on your phone, that is good evidence, but he is likely to say that it was material he was sending to help with your marriage, or material you requested he send. He will lie. Most likely, he will.
You want to be very factual and straightforward. And on the brief side. Let this guy kind of expose himself with long, convoluted explanations.
Again, it is entirely your choice whether to report it or not.
The prime benefit is if a second or third patient complains, then it will be taken more seriously. That is, you will be incurring cost to yourself and disruption to your present life to potentially help the future.
You're a good person. I'm sorry this happened to you.
Please do not see this bad therapist again. Either send him a short email or text, maybe just one or two sentences. Or maybe send something to his receptionist or administrative person. Or, just cut him off cold.
This selfish lout of a therapist does not have your best interests at heart.