There’s a situation there’s this 18 year old that fancies me I don't know what to do?

I seen him tonight at my disability club and he bought me a drink and was calling me his “girlfriend” and telling people I was and I just don’t know what to do I need help he’s 18 I’m 27 😩

There’s a situation there’s this 18 year old that fancies me I don't know what to do?
Post Opinion