Boundaries

If I don't enjoy the conversation, stop it.
He has a choice to continue with a conversation I find acceptable or one I don't.
I don't need to help him deal with his stuff.
His stuff is not my business.

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This puts the cart before the horse:
1. Listening with compassion, even if it is damaging to me.
2. Disengaging.

This puts it right:
1. Disengage.
2. Then if there's a way to connect in a fashion that empowers both, go for it.