- He makes an effort to touch you.
- Smiles when he's around you.
- He will try to hug you/high five you [refer to 1st].
- His friends are nicer to you/start noticing you.
I'm really not that much of a flirting expert, but this is a great guide that provides tons of thorough tips.
Even if he doesn't like you, it's OKAY. I want to emphasize how many other guys there are out there. He won't be the only one, trust me. [ Sima's advice column | Ask Sima A Question ]
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