Misguided... First up you must be doing something right for your son to find you so approachable.
Secondly I thought telling you about my friend may be of some help. Some people have said that it is too young an age to know your sexuality. However my best friend is gay. He was brought up as a JW and is now a successful fader. When my friend told me that he is gay he told me that he has known since he was a child that he was different. And once he hit puberty he knew definately that he is gay.
What I am trying to say is that your son may be very aware of his sexuality. It doesn't necessarily mean he is going to act upon it. If he told you he liked a girl I am sure you would not assume he is going to go out and start having sex or anything. All you can do is continue on in the path you have already gone upon. Continue to remain a confidante for your boy and give him the support he so desperately needs during one of the most awkward stages of his life.
Miss Peaches.