Relationships (of any kind - friends, family, lovers) that are based on anything less than honesty are nothing more than superficial exchanges. Things that have been shackled, and denied the light that truth brings, will never grow or expand. As difficult as it might be to accept, someone who lies to you does not respect you. Someone who does not respect you can't really be your friend. As disappointed as you may feel, there is immense value in accepting this.