Why would a girl be intimidating?

I have a guy friend and we’re close. We text almost every day and love teasing each other (he does more than me). However, he admitted that I intimidate him?

If it is romantic wise, he’s all over the place. He asked a girl his number in front of me but it never is serious. He always includes me to activities and invites me out with the other guys (that i’m not close to like I am with him).

Why would a girl be intimidating?
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