This is weird

This is a bit odd but I’ve been talking to a guy and the first 15 days was like heaven. He constantly told me how beautiful I am and how he is fascinated by me and then it all went away in ONE DAY. Idk why but I’m still the same when he’s just not into it anymore. Starting to feel like a fucking loser. And it hurts. I want to make him feel the same way. How can I make him feel like I don’t want to talk to him or I’m not into him anymore? Effectively? Please help me guys