How will a guy act around a girl he really likes? Especially if they're already really close?

kklove
I want to be able to catch signs that this guy likes me, but it's hard to tell. he's normally very confident and outgoing with everyone (and naturally touchy) so Im not good at picking up on hints when he tickles or play fights with me. How do guys act differently with girls they have strong feelings for in contrast to girls they just want to fool around with?
How will a guy act around a girl he really likes? Especially if they're already really close?
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