Sensitive topic — would you forgive someone whom lied to you about pregnancy ?

My cousin told me she is pregnant. Her stories over the course of two months kept changing. I was very sceptical about the pregnancy. Nothing added up. Coincidently she had her early scan the same time my best friend was there today. My friend assured me she did not see her there. She was there a longtime due to issues. She has no reason to lie to me. Theres no way at this centre you can miss someone its very small. I asked my cousin did you attend your appointment and she replied saying she did. My friend assured me she was definately not there and she was there many hours due to some issues shes having. Theres no reason why my friend would lie to me. Im so upset as my cousins done this knowing its my angel baby boys 3rd anniversary in 3 weeks time. She knows how bad it hits me. How low can one go to lie about a pregnancy. I feel sorry for her she can stoop so low. I am concidering not speaking to her anymore as i feel so upset. Would you forgive someone whom can lie about pregnancy ?? Shes done this for attention because shes that kind of girl. Shes not young either so shes mature and understands how it can effect someone. How would youreact ?? Thanks for replies much appreciated in advance.