Here's something I found on another question that might be applicable for you
"You can still be nice to him, while "rejecting" him. People are human and have feelings. He obviously likes you. If he tries to talk to you, keep it short and say you have to go, or make sure to have other people in the conversation, and then you slowly walk away. There's plenty of things you can do to friendly avoid a person. Good luck."
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Next time you're talking to him, get him to introduce you to other people. Use him to make new friends.
Ask him about some of the guys too. Like "He's cute - what's his story, is he single? Can you introduce me?"
"I think you're a really nice guy and I appreciate that you invited me bowling. I've had a good time getting to know you but I feel like I need to let you know that I'm just not interested in dating anyone right now, because I wouldn't want you to feel like I lead you on".
talk to him about other guys and next time flirt with a guy you find attractive in front of him
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You should always turn him down. Tell him that you have your eyes on someone lse
super simple. just mention your boyfriend, fictional or otherwise in casual conversation i.e. "yeah the other day my boyfriend and i...blah blah blah." if he keeps pursuing, then he's an idiot.
talk about other guys a lot and flirt with others a lot
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