I don't really understand why you'd damage, or outright ruin good friendships over this. You didn't really hide it or lie, you just really didn't feel it mattered and she did. Kind of dumb really, not like you're actively sleeping around behind her back.

It's your decision to make, but throwing away your closest friends for one intimate partner that might not work out is a pretty bad bet. Even if you win the girl, you've lost two friends, both of who were intimate with you. You lose even if you win.

Good luck though. Hope you get whatever it is you think is a positive out of all of this negative. The real fuck up was the conclusion you somehow kept coming to and followed through with.