Why do you think girls don't text back?

Assuming YOU are a guy ....
girls are always hoping to find a relationship. So if they LIKE you, they will ALWAYS text back.
And if they don't . they aren't interested in you in THAT way.

They're not interested. Same with men. If you're really interested, you text back.

the same reason guys dont respond ---- they are not interested

Maybe she forgot to reply... that happens more then u think

She's not interested. Girls will get SUPER creative when it comes to talking to guys they like. She might take a little while to respond (can't seem to eager!) but if it's too long, or if she never responds, she's not interested.

they're not nice