They do allow divorce for infidelity, though they will encourage even those couples to stay together, lest they bring disrepute to the good name of Jehovah (lol?).
Sorry, I've only just got this message as I have been unwell.
I think it actually depends on the congregation where infidelity has occurred. So, in my old KH in Mt Florida, Glasgow there was a Bro and Sis df'd for fornication/adultery, fornication on her part, adultery on his. He was still with his wife even after getting reinstated. His wife was coerced I suppose to forgive him because to err is human and forgiveness is divine - or something.
Compare and contrast that with the film called Deadly Devotion on youtube about Kim Anderson. I've linked this story which is really upsetting, so if you are not in a good place today, re: shunning, CSA then don't watch.
https://www.youtube.com/watch?v=7k8gA37KMGE