Do I tell a girl I've been thinking about her?

I've met up with this girl a few times, there's most likely something there. Thing is, I've been thinking about how much I like her this afternoon, and although I think it would be a nice thing to say that to her, our relationship is pretty feisty in ways and I'm not sure if it would be breaking the manly wall too early.
Do I tell a girl I've been thinking about her?
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