What to do if I am head over heels for a friend, but my best friend hates him?

So my friend is a really nice guy and he has good looks too. We see each other and talk a lot throughout the day, and recently he fell asleep on my shoulder on a drive. I love this friend, but he liked my best friend a while back and she rejected him and absolutely despises him. I don't want to make her mad by liking him though. What do I do?

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I told her that I liked someone and she directly said, "It better not be..." as I the guy. And I said okay. I'll tell you later.
What to do if I am head over heels for a friend, but my best friend hates him?
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