Posters are angry on behalf of the OP, even though we don't know her and never will. That is one hell of a kick in the teeth she's just got at a time when she is so vulnerable and emotional already.
The bare idea that a very few people piously opine that she should expend any of her no doubt already fragile energy on a man who has so callously and cruelly betrayed her, makes me personally quite incandescent.
She cannot influence any of his choices. If she could have, we wouldn't be here. If this man wanted to do anything untoward, nobody would stop him. And I am furious that some of you think it's ok to put this on a brave and lovely lady whose life has been torn to shreds in the space of 24 hours. It's actually evil. How dare anyone try to place that burden on her?! A man who has lied and cheated for a year, a man who has got his wife pregnant while also screwing another woman, a man who walked away last night without so much as checking on the welfare of his wife and young child???
On your bike. That man thinks too much of himself to do anything stupid. And even if he did, it has got nothing remotely to do with the OP.
It's a ludicrous suggestion. The OP needs every ounce of energy for all that lies ahead for herself and her little family.