Pinterest girl.

Hello, so I met this girl on Pinterest and I thought we were going to be good friends, she is 14 and super sweet! But recently she started getting flirty, saying things like: “once I cycle to girls I might just snatch you up” what the fuck should I do? I’m not comfortable with this, at first it was cute and sweet but now it’s getting needy and desperate I have a fucking boyfriend that I will stay with until we either die, or break up which hopefully isn’t soon, so yeah…should I just block her?! All she does now is give me signs that she wants me and I’m just acting oblivious… someone help or give me advice too. I do not like her like that, I see her as a friend, PLUS IDK IF SHES EVEN REAL AND NOT JUST SOME CREEPY OLD MAN! SHOULD I BLOCK HER…?