Finding out your partner is +

What would you do if you find out your partner is carrying the virus hiv and hasn't opened up about it to you? Would you continue with such a person even after they have been selfish and put your life at risk of getting the virus? I don't know how common this virus is in other countries or continemts but for those who know about the pros and cons honestly is it fair to keep away such information? Having a virus in your blood is not a death sentence but how do you go about such a shocking discovery? Am so sad... 😔