What's your thoughts on love and trust?

So starting with my story

When I joined my school newly. There was a guy who was continuously staring at me and smirking slightly. I ignored him but day by day his smirks grew wider and he stares at me like I'm the last person on the world, and one day he asked me out. I rejected him but he found my snapchat and requested me and after thinking about eight hours i accepted the request and then he said i love you

And now i don't know what to do, please tell me and advice me as your little sister.