Which might be a fair point if he'd actually done this to spite you. The consequences of what he's done should have less to do with you and more to do with the people he's hurt. And yes, part of that is letting him know he's let you down.

But giving up on him is basically saying there's no way back from this. Which might just lead him to end up thinking he might as well do whatever the hell he wants now. Part of him being here, surely, is to realise that you can find a way back from where you are.