I still have feelins for this guyy but ughhh i dont want him to know that?

Me & my ex boyfriend of a yr just broke up & he already has another girl? But he still texts me & says he still cares. How do i act like i dont care, I still do have feelins. But i damn sure dont wanna let him knw that. Because if he knows i still care then he will think he can just have me bak whenever he wants, but thats NOT happenin. #imdoinme.