Cut yourself some slack. Please. Its not the end of the world. Did you make promices to her that you were going to be together forever? Have you lead her on? If she is having sex with you right away, then I dont think that this is something totally new for her.
As long as you are being honest with her, just chalk it up to being human. I know exactly how you feel. I let my "hormones " get the better of me a few months ago and I felt like crap. I havent gone back and told the woman ( that I wasnt that attracted to) that I was not ready to persue this. She understood and that was the end of it. She is now in a realtionship and we actually talked the other day to get a mans perspective in a dilemma she is having.
Dont beat yourself up over it? Does your ex know about it? If not, IMO, she doesnt need to.
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BITS M-46 W-42 M-16y T-19 y s10 s15 BombDec.19/09 Sep-F16/10 Sep Papers signed by W- June 30/10 Recon July 5/10 PA foundOut- Oct 30/10 Mental HospNov/10 moved out Nov/10 Leg Sep Mar 15/11