To be? Or not to be?

Ok, heres the story...
I like a guy at school that my friends really dislike. He is a total twit to them, he loves annoying us.

Outside school he is real sweet, we flirt, we even spoken about a relationship. Still, I think he likes one of my friend better...
He makes me feel secure, but no one knows we are planing a relationship, I'd hate to see my friends reactions...

.. Confusing. I'll list it off.

1. Your friends do not control you, if you want to date him, and they were good friends; they'd understand. Surely they'd do the same thing in your situation? (Dating him?) It's not as though you're betraying them, and if they dump you as friends for it, is it worth it for you, and were they really that greater friends?

2. Ask him if he likes your friend more. If he does, too bad, you shouldn't date him and be a second option. If he doesn't, good.

3. Ask him why he's like that at school and not outside, questions like that etc.

Basically if you want to date him and he wants to date you, WHY NOT?

Hmm... Thanks for the advice =) We have dance practise together on Sunday... See, we agreed we wouldn't talk to each other about this during school and he doesn't have a home phone number and I'm low on credit to call his mobile, nor does he have credit

I agree with the above.
if your friends don't have a seemingly resonable argument, then why are you listening to them? they should be standing beside you, supporting whatever decision you make. if they aren't, they don't seem very worth while.
and something else. think about the guy. if he's annoying around other people, and really nice one-on-one, think about what will happen when people he knows find out that you're going out. it's not going to be pretty. when guys seem to have two sided personalities, you have to be very careful. what if he's only being nice to you because he's just playing with you? how will that feel in two weeks? in two months? in two years?
don't think just about the now, the people now. think about you, and what's going to happen later.

If he likes your friend more... just be friends with him. though, does this friend of yours if he likes also think he's a "twit". if so he'll realize it sooner or later that you're there, just don't get too involved if he still likes your friend, esp. if she might change her mind. getting into a relationship with him while he still likes someone can get either or both of you hurt, though don't worry about your friends (maybe the one, but friends come and go - does love?)