WOULD YOU ACCEPT A CHILD THAT YOUR MATE HAD ON YOU?

How would you feel if your mate had a baby with someone else while in a relationship with you? Would you be willing to accept the child like your own? Do you think you would stay with the person or leave them? I'm sure men would take the situation a lot harder since after having a child the baby always goes with mom never the dad. Women have it easy because the child wouldn't live with them. Do you feel like it's better to walk away or try and make the relationship work?