Guy I'm interested in stopped responding to texts, what now?

This guy sent me a Facebook message 5 days ago saying, send me your number so we can finally go on a date!
we started texting the next day. We both work full time but have today off which would have been a good opportunity to hang out. I texted him last night at around 11pm and here it is 4:45 pm the following day and i never received a response from him. I looked on his Facebook and at 9 am a girl said "drinks tonight, no excuses!" he answered 3 minutes later and said "you bet" and then he proceeded to suggest the place to go and they cemented plans.
he has the same iPhone 4 as me where he uses Facebook on his phone so how could he see and respond to her Facebook comment but not my text message.
is this his way of saying he's just not that into me?

Yes.

Do not contact him again… If he wants to talk to you he will and you ignoring him will make him want to talk to you. But if you keep texting him he'll think you're annoying. Don't stress it at all

He doesn't like you, if he did he wod hav answered u?

Yep it seems so. So the best thing you could do is to move your interest to another.

Let him come to you. Read what you said to him, and think "should I have said that?" Don't text him, let him come to you. And he may be a user, if he want's something, just ignore him

I wouldn't make it a big deal.hes obviously not wanting anything serious of any sort.