Getting in other people’s models

My boyfriend recently told me he wants to get revenge on the man his ex wife cheated on him with. I have the thought that he blames the man and not the ex wife and takes no responsibility himself.

I can see I’m getting in someone else’s model, but I want to help him as much as I can without forcing the model down his throat.

Should I just nod when he says things like that or give my opinion/advice. He hasn’t asked for my advice, so maybe not that.