I'm going to bullshit a girl who considers me a friend
Why are you planning on doing such a thing?
I know it's wrong but I do not care at all I'm such a asshole
Knowingly lying to another friend is a pretty mean thing to do. Even if you do not care about your friend's feelings, try your best to at least care about yourself as a person. Do you really want to be seen as a liar?
I just want to get revenge for a lie she did
Why stoop down to her level by taking revenge? Show others that you are a stand-up guy. One lie is going to lead to another, and it will eventually become complicated to the point that it will cause you more headaches down the road.