Did I do something wrong?

Did I do something wrong?
I talk to this girl from my class on Facebook and I would just start out as asking for the homework and she would tell me but one day she was sick and I offered her my hw and she said thank you then I said I hope you feel better and she said thank you:) then I said if u ever need help with I thought at that moment she liked me but then it got better I then asked her what the hw was again and she said it and then told me that she could give me her number because it's easier then Facebook then I said if u need help in Spanish I could help you and I texted her and we had a brief convo only bc it was just to let her know that it was me that was texting her and not some random guy and then I texted a day later saying hey and she didn't respond and two days later I said hey what's up and she still never responded why is that?