Never act with your anger. Make a plan to talk to her. Do not use an approach "you lie to me!". That would be a disaster. Just tell her sth like "I will be more open/clear to you and I expect you to be so. I won't judge you if you make a mistake, so feel free to share anything you do/feel." Why she lies to you is that she's afraid that you might react angrily if you knew the case. So make her feel comfortable.

hey tell her your feelings and how much you love her and tell her that you want her always honest with you and never afraid to tell you the truth and she will understand you .hey donot forget to take some roses with you when you are going to speak to her.

the best friendship should be cherished . don`t do something you will regret for an angry thought.maybe you losed ur mind then so just calm down and think the whole thing clearly. good luck

Go ahead and find your new friends.

Stop crying! Get on with your life!