My husband suddenly texted that he had a daughter outside and planned to take it home. Should I get a divorce? worried

I feel like I'm going to collapse. I can't post it after posting it several times. Don't you know why?

I have been married to my husband for 6 years and my son is 5 years old. My husband suddenly has a four-year-old daughter, and I really can't accept it. Pretend to work and shut yourself in the study and cry and cry. Dare not let the children see it. What the hell should I do? Divorce or accept?

This child belongs to my husband and ex-girlfriend. In other words, not long after our son was born, he and his ex-girlfriend became pregnant and even gave birth to a child. I really want to curse. Is this a TV play? What the fuck is my life? I still feel quite happy. Am I too stupid or am I too stupid? It turns out that he has been taking care of their mother and daughter for so many years. I don't fucking know (forgive me for cursing) that I'm feeling chest tightness and shortness of breath, and I feel hopeless in life.