Advice please

Not really an is-it-normal kind of question, but just give me some advice. It's tearing me down from the inside.

-
Girlfriend: Emily
Her Friend: Bec

2 days ago me and Emily were at her Bec's house. I thought it was going to be really awkward, as I'd never met Bec before - but she was really nice.
My girlfriend had to leave, and her dad picked her up as she lived a few miles away. I was going to walk home as I didn't live too far away.
Anyway Emily left with her dad, and Bec asked if she could just go get me a drink of water while she clean up. I did do as it was mostly my mess :$. So I got up and filled up the glass, and on the radio and that HelloGoodbye came on. I started singing to it quietly, and I didn't know Bec was behind me but she started singing aswell.
She came closer to me and I don't know what happened. I guess it was just the most romantic moment in my life, we got closer and she started playing along with me to the parts where it says:
Cause our lips,
Can touch,
And our cheeks,
Can brush.
Our lips,
Can touch;
Here.
Long story short(er), I ended up getting laid. Then on Monday, she must have told someone because it had spread throughout the whole of her year at her school, and my year at my school (we go to all-girls, and all-boys schools).
My girlfriend just walked straight past me today and all the other girls think what happened was "cute" and won't help me out.. (they don't know about the sex... PHEW!).

Sorry for the long story, but i tried getting the main detail in. And I'm only 15, so I'm not too good at handling relationships.

So Thanks for all advice

Do you think it's normal?

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