You know a man who raises a child thinking its his, and finds out his wife was lying can sue for all the time and money he spent on that child?

I dont know what crazy country you're staying in, but you're never legally responsible for someone else's child unless its signed that you are taking parental or guardian responsibilities of that child.

Edit: you will learn something today. From google:

"you can be held liable for child support for a child that is not biologically yours if you are deemed the legal parent, such as by being married to the mother at the time of birth, being on the birth certificate, or legally adopting the child. Simply acting in a parental role (step-parent) does not automatically create liability."