How do guys feel when they are really into a girl, what to they think?

Anonymous
When a guy is at the stage where he blushes around the girl, smiles without realizing it and stares at her intently, what could the things he's thinking be like? How much does he think about her when she's away? Are those thoughts mostly physical, or do guys get super cute and romantic too? I know there's no way to generalize this, but I still want to try to get insight into how guys feel when they are into a girl.
How do guys feel when they are really into a girl, what to they think?
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