I'd be really grateful if you guys give me some advice, thanks.

Okay. So, in school, there is a guy that my friend likes, and she told me who it was, and I was like, "Okay, so you like that person. No problem." However. The person happens to be very charismatic, and after I went to a afterschool club for the first time, with the same friend, she neglected to tell me that he was in the club as well. After spending 45 minutes with him and other friends, I could definitely tell why she liked him. In fact, I like him a little as well. The next day, you know that feeling you get when a person who likes you looks at you? I got that feeling from him. I'm very hesitant about going back to that club where he and my friend will be there. Also, i will say that when it comes to situations like this, I usually aim for the guy and not really my friends feelings, lol. However, im not so sure if he will keep liking me as he gets to know me better (my personality isn't bad tho) or will,he keep liking me if I stay out,of his reach.
What should I do?

If u like him.... go for it

but think about the consequences. I have multiple personalities because of my personalities no one likes me. 'Cause I have kind of a sadist\masacist personality but I found someone.

If you want to be a good friend, it's best if you keep it down (be friendly, and only friendly) and be friends.
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If you really like him, it will hurt your friend. I know it will hurt your friend, but if you really, as in really like him, show him some signs.

But either way, someone gets hurt. The question is: Hurt your friend or the guy?