If I liked my bff's nephews friend and i told my bff and she pretended to be dating him should i be mad?

Answer 1

yes you should be mad

Answer 2

You should talk to her and find out why she is acting like that. Ask her to be honest with you about why she is acting like that. Maybe she likes him too but was afraid to tell you. Instead of being mad at her and not speaking to her - work it out and find out why she lied to you and acted as if she was dating him in the first place. Let her know you are best friends and that she doesn't need to do that.