Which version of problem-solving method should I choose to keep my self-esteem due to almost-discovered lies?

I want you to choose, and give your opinion.

Issue:
I just lied to my lecturer’s assistant that I was moved from a very famous university while in fact I was from not-so-famous ones. All my other acquaintances also knew since he asked me in front of the class. He somehow managed to corner me and almost-find out about my lies but I didn’t admit it. I’m going to meet him again a few days from now, and I’m afraid that he’ll ask me again, or even worse, force me to admit it. At first I thought lying to him and those I have no close relationship with won’t matter that much since I won’t spend a long time there to meddle with them until my graduation anyway. But… I feel like it may costs me lots of self-esteem. I’ve designed 3 ways to solve this issue to lower the cost of self-esteem as low as possible but I don’t know which one is better, please pay your attention:

Method 1:
If he asks then I’ll honestly tell him the truth that I lied to him, and them since I was afraid that they may underestimate me for coming from ‘bad’ place, or even give me a label. I don’t want them to give me a pity.

Method 2:
If he asks me then I’ll tell him another lies in order to confuse him, and hoping that he won’t know much about it. Another lies again if necessary, and being persistent.

Method 3:
If he asks me then I’ll be mean and blunt to him, I’ll act like a Bit*h and say “I lied to you! So what!? I don’t even care about it!”. I suspect that they may be shocked by my bravery and will hate me for sometime, and then they’ll forget it and treat me like the way they used to be.

So… Have you give it a thought? I know whichever I choose will cost me my self-esteem but I want it as lower as possible. Do you think there’s a big chance that he’ll forget about it and never ask me again? I can be flat-faced and overly-rational if necessary. I’m so embarrassed… I may even have lost some self-esteem for asking this question.