his ex wife In jail and admitted to sleeping with his friend

So this weekend my partners ex wife called while we were shopping to let him know she was in jail. They have been divorced since 2023 and she was on probation for DV. She was telling him she in jail due to the old case with him. She said she was calling him because none of her family members would answer. Also I’ll mention that she cheated on him multiple times and has been physically abusive to him,they were in a 8 year relationship. He is originally from turkey and was raised by his grandma and very respectful to women. So yesterday she called again from the jail to confess that she was actually in jail because she got physical with one of his friends,a friend she been sleeping with. Thus friend is someone I’ve met a few times and he just gave me a phony vibe. My partner called his friend and he was refusing to answer. Then he said his friend blocked him. And earlier he was on the phone not sure with who,but he was asking questions such as “how long has it been going on” “did you go to a hotel” etc. im trying my best to be supportive but I’ve never been in this situation before. He said it’s giving him ptsd because when they was living in turkey she cheated on him with an afghani guy,now it’s his irani friend. I’m trying my best to be supportive .