How to try and get your crush to have intrest in me again?

I like this girl but I started losing intrest when I noticed she lost intrest in me, she would do all these thing flirting with me trying to get my attention but now she does non of those things or anything that she would do, she gave me her number but I didn't ask her for it I texted her we would text for an hour but now I text her she replies back I do to then I don't get a reply back ever again. I don't text her everyday I text her every 2-6 days. I really like her and want to try to get to know her better but I get spool nervous around her, I never been so nervous around a girl the way I'm nervous with the girl I like, she the only girl in school that I get nervouse talking to, the rest of the girls i know I can be myself, I don't know why I do that. but I came out too strong and made a bad first impression I think. what can I do to get her interested in me I don't care if it will take a while, I'm up for it.