Why do she and i talk so much?

Theres this pretty girl i personally know. I used to like her friend but that tragically screwed up. Am i just entertaining her/ text buddy? I dont know if its everyday but when we do we could talk for hours. I remember last week she and i had a convo that lasted for 6hours. We dont live close so we text. I would date her but im not all lovey dovey over her. Its just that i dont see why we talk so much. She starts the conversation like 70 or 80 percent of the time. We somehow always let the convo keep going. I would just stop texting out of no where only to get a text later how shes now mad at me because i stopped texting her. I like her but i dont have a crush on her. I have other female friends and i dont know if girls do this. Only girls i liked who knew i liked them i ever talked to this much. But why do we talk so much? Shes real pretty and im sure other guys think the same. Plus shr enjoys making me mad. Like shell tell a lie and let it go for as long as i believe it.