I like the same guy as my best friend...?

[kate]

So I have liked this guy since last year. He ended up going out with a close friend but they broke up after 10 months because she was horrible (lied, cheated and such) he broken up with her and doesn't want anything to do with her. He talks to me and my best friend on twitter and kik and such and we are quite close. I found out today that my best friend likes him. I said to her that I liked him also.
We agreed for it not to affect our friendship and if he liked her I wouldn't be bothered and vice versa. Only I think I am a bit bothered. I mean, she kept messaging some of then stuff they were talking about and I started getting jealous. I really like this dude, more than my best friend since I have a bad rep for friendships, and dislike the majority of my friends anyways. I'm close to my best friend but I can tolerate her being with the guy I have liked for ages, I guess.

I just don't know what to do. How can I be more confident, smiley and just generally better around this guy? Its not a competition, I know, I genuinely like this guy and I think he likes me back. Him and his ex broke up over 3 ,months ago and he says he's over it. I duno, I mean when I talk to him in person I still get butterflies and freeze up. I just want to make myself more attractive personality wise.... How?!