i was in a similar situation, we have fun with eachother everytime we're together n we have fun convos but i asked her to hang out with me twice n it was an excuse on both occasions. the first time she had to babysit, the second time she didn't have enough cash to go where i was going. Unlike your case though, the girl i was talkin to never contacted me first, i always initiated the convo unless we see each other in person, which she would speak to me first.
I tried cutting off contact to her for a week to see if it would make things any better. But it made no difference at all so I just went on with my life. We ran into eachother again yesterday, it was pretty much the same deal and we had a convo over the internet but i'm not looking into it and i think she may be gay or bi...
if u get the answer... let me kno.