How can you tell if you are just a one-time thing?

Anonymous
So guys, help me out. How can you tell if you are just a one night thing at a party. Meaning, you're just a hook up, and you will never see her again? And how can you tell that it's not just gonna end that night, there will be more? As in relationship, or dating? What are some signs, body language, things he would say. HELP PLEASE.
How can you tell if you are just a one-time thing?
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