Help with girlfriend

I started 8th grade with not much hope of getting a girlfriend. But i somehow i found out i girl liked me. This usually doesnt happen to me soo i was a little confused on what to do. I summoned the courage to ask her out and she SAID YES. I was really happy and i still am. Uesterday was three weeks and im really happy. I all of a sudden relised that i want to stay with this girl. Right as i decide to be happy she seems to become cold all of a sudden she respondes to my text with "ok" all the time and she makes me feel like im a nusiance. I really like this girl and i dont want to lose her soo what do you think i can do to not lose her.

Girls like her need attention from their man to see if they still care, reply and ask her whats wrong & if she says nothing then theres something. because yous were on cloud 9 together ofcourse theres always that someone that has to spoil that happiness and make the situation turn sour. shes wanting attention from you thats all no biggy.