Suicidal talks?

My mum cheated on my dad and she's saying it's all his fault for not giving her attention and when he apologized she said she couldn't forgive him but when she cheated she expected him to get over it within the day after telling him there's 3 men and she won't let them go and now his talking to me about suicidal attempts and his going to make her suffer for what she's doing to him, any advice?
Suicidal talks?
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