You don't have to leave. Now that you have come clean, staying would give you an opportunity to practice honesty. You're still the same person you were. While noone likes to be used, you really have done more damage to yourself than to anyone else here. And you have contributed meaningfully to the group also. It's your call, but none of us have asked you to leave.

<font color=blue>Life is filled with tragedy; if you let it overwhelm you, you cannot enjoy life's innocent pleasures. -Robert Heinlein</font color=blue>