My brother met a girl through tinder 4year ago. They had a brief relationship before she found out she was pregnant but they made a go of it. Since having my nephew she has him numerous times, sometimes worse than others but he always goes back. They recently got married and I thought things were getting better. My brother works away and comes home as often as he can. It recently came to his attention she was cheating on him. Starting with texts a few week before he was due to get married to full on affair a month into marriage. She blamed it all on him, it was his fault for working and not making her feel special. She admitted to everything and gave all the gory details and still played victim. He spent Christmas blaming himself for the break up of his family before agreeing to go back to her. We are a really close family and he’s becoming so distant and withdrawn. He drives a lot with his job and is usually under pressure. I am terrified for his wellbeing and mental health but what can I do?