Guys, What would you as a guy do if you were seeing someone but not serious and they said they were asked out and are considering saying yes?

But you're not seeing them seriously because you have a hang up but you have strong feelings for them and deep down would be hurt if they see someone else because you thought they had feelings also.

Guys, What would you as a guy do if you were seeing someone but not serious and they said they were asked out and are considering saying yes?
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