Dude, listen. I'm a guy and guys have it tough. We have to basically fight for female attention and it isn't easy to come by a lot of times. Would I pass up making out with 2 hot chicks just because I have a girl online that supposidly wants to meet me someday? Haha, nah!!! Especially not if she's 'flirty' like you say this girl is.
Online dating is even more of a crapshoot than meeting people in person. You NEVER know about their real intentions as it is very easy to hide behind a computer screen. Tell you what, you go have your fun and even date someone near you if you want to. If this girl ever decides to meet you, then worry about it then, but for now don't put your life on hold for something that may never happen. Trust me on this, bro. I've seen it happen to friends of mine and its sad.
Yeah, I agree with everyone else. Please do not get yourself in a "committed" online relationship. I was in one of those for about two years and it was the biggest waste of my life!!! He lived in England and I in the states. We always wanted to meet, but it wasn't meant to be. I know that online relationships can work out, but all I am saying is please don't commit to an online thing and leave out real girls. You never know, someone may come along and sweep you off your feet and since you are committed to this online girl.. you'd never get to know her!!!