Lost with what to do?

My wife ended up in a 3some when we went to her friends house 3.5 yrs ago with her best friend and her best friends husband. After she relized how much it hurt me she said that she would fix it by getting her and i a 3some well it has been years gone by and nothing from her not even a hint of it ever happening.
What should i do i love her but i am even more hurt now that i feel that she lied to me and made a promise that it seams will never happen.