Im a dude that needs girls help plz help?

ok so how do you tell if a girl really dont like you anymore and or weither or not she jus dont wanna show that she still like you cuz im tryin my hardest to get my ex back and like she jus dont talk to me or nuttin she dont answer my texs or calls she may sometimes tex back and like how do i no that she isnt moving on or she found some one else