I agree with QUEEN OF WANDS. Since he shows he's inconsiderate in other ways besides this huge mistake, I think you should end it too.....then he'll have 2 women to pay child support to and no one to massage his feet.

I know the feeling of this kind of devastation and I know it hurts like hell. He's a very selfish man. You deserve man who can reciprocate the amount of caring you put into a relationship. Any man would love to have you as a partner. For him to cheat when you're at your weakest is very low. Whether you stay or go, it's going to be painful but at least if you go, the pain will end.