I'm so sorry you're in this situation. Been there, in very similar circumstances. This is a good and valuable subreddit, but there are others that deal with infidelity that you might also find helpful in this case. I certainly did when I discovered my own husband's infidelity. I won't mention the others, but maybe you can have a look around.
The movie is so very powerful. I watched it and I was shook. Cried a lot. I think it should be required viewing for young people. Plus, it's well made. It doesn't put a foot wrong anywhere.