why don't girls reply? 😭

So this girl that I really really like/am interested in doesn't answer my texts and it's really annoying. I just wanna talk to her and I love when she responds. I always try to make sure to respond to her in a timely manner just to show her that I'm really trying to hold on to conversation because I like her a lot but she will not reply consistently. She's a Scorpio and I know they like their space. But is texting her making her feel like I'm in her space? I feel like it wouldn't but who knows. My thing is, why give me your number if you won't reply? It's annoying. I really want this girl. She's just being difficult lol what do I do? What can I say? Why do girls play hard to get? haha HELP 😭