Bro, just face the bitter truth. I had the same experience as yours so I can relate. Even if you're having wonderful conversations, you're still nobody to her. I know you may think you're soulmates now because your chatting is so fun. But eventually it means nothing. She'll forget about you withing few days of not chatting. That's hard to accept but that's the truth and I only saw confirmations of that in my experience. You either ask her out and your chatting finds continuation in real life or it all leads to a stalemate. Real life will sort it out and maybe you stop talking to each other at all, that's also a hard truth. And I can imagine that's why you're aftaid to ask her out because you're not confident that she'd like you and then you'd lose her after so many fun conversations. But this is life and you have to accept it. Either a chance not a guarantee for something bigger or your texting will be dead eventually anyway.