He thought I wasn't playing, but I really was playing.
What would happen if he found out you were the one playing?
I'm pretty sure he's not going to be happy.
Lies are damaging to relationships because they block trust and familiarity with each other. You should come clean and make amends with someone if you've been lying to them.
I'm a great liar. He'll never know it was me.
Regardless of how good you are at lying, that doesn't make it a good thing. Being honest with them will be the best way the approach the situation.